SIB

Members
  • Content count

    15
  • Joined

  • Last visited

Community Reputation

0 Neutral

About SIB

  • Rank
    MIDIbox Newbie
  1. Thanks, do you know if the expansion port of the MB-6582 permits to simply ad a box with Jacks for CV input? @ Hawkeye Sorry for stealing your time...
  2. You are right, but the datasheet confuses me. The register-map on page 3 lists the Registers for each of the FCs seperately. If you apply FC/Lo and FC/Hi at the same time you will also need two different FCs. If there was just one 11-bit input for both that would mean, that both filters coult not be controlled seperately. They would always be applied at the same frequency resulting in always filtering out the complete signal. To have any signal left FC/Lo has to be lower than FC/HI. On the other hand the register map does not show any MF for the BP. If it would not be possible the use the BP with together with the other Filters, it could be that for this one alone the registers for LO and HI are added, but the datasheet mentions on page 6 that all Filters can be used simutanely. The example they mention is only for LO+HI. Btw the Ctrl based eitor for the MBSID V2 contains and shows all (?) necessary controls that are being discussed here, in a manner that could be an example for a hardware CS that is only controlling the SID-Parameters (only missing the CV ins, but there are Midi-Sync Buttons). The pods do also show the exact number of steps (The MB SID Menue does it in HEX, at least for the filters) for all parameters matching to the datasheet :). Confusing is, that the FC is ranging from 0 to 4095 = 4096 stepts -> 12-bit... (from 000 to FFF in the MBSID Menue).
  3. Not exactly... The filter seems to have only 2 controllable parameters: fequency-cutoff and resonance. What I wrote in the previsous posts concerned only the resonance. I got a bit confused and missed out the FC. But there is much more. I will leave out the on/off options, because they are not of interest for CV-Options. But there are a lot more (8), like filter modes etc. The FC of the SID is not simply one FC. In fact there are 2 different Fcs. One for high-frequency and one for low frequency. The FC is controlled by Registers $15 and $16. Each register is 8-bits. Bits 3-7 for LC are not used, so FC/LO is actually 3-bit (8 Steps). FC/LO uses all 8 bits, so it is 8-bit (256 Steps). The Wikipedia-Article adds this up to 11-bit, because those registers can be controlled together by a 11-bit number, but that does not mean, that it's a 11-bit (2048 Step) Filter. Bit 4-7 of Register $17 control the filter resonace, that is 4-bit (16 Steps). Bit 4-7 of Register $18 control the volume, that is 4-bits (16 Steps). The documentation of the SID that I used can be found here: http://sid.kubarth.com/files/ds_6581.pdf @NorthernLightX I think my starting point is a bit different. I never intended to copy the design of the MS-20. It was more the idea behind it. What are the components and what can be patched. Analogue patching has turned out to be pretty limited. So now my interest has turned more to "softare-patching". Maybe I should start a new topic or join the discussion about the MB VC V2, as the topic has moved quite a bit away from the initial title... So my starting point is more the possibilities of the SID (I grew up on playing on a C 64). When I have understood the possibilites I can go on an look for what has already been done (probably nearly everything) and chose among the possible implementations. Right now it's much more about learning to me, than going the fastest way to the finished product.
  4. I think there is a misunderstanding. In my last post I was not writing about the internal-"paddle-input"-A/D-converter, but about the minimum requirements for an extenal solution. You already proposed the implementation with existing MB Hardware (thanks for the link btw, I always overlooked that one). That implemenation would require software-downsampling to 4-bit to write to the registers of the SID. You are already 2-Steps ahead of me with you implementation ideas (thanks for that). I am still making my way throug the possibilites of the SID. I think I have to go that way, even if TK already knows about everything. That's why I wrote, that this theread probably won't be any news to the hardcore-Midiboxers, in the introduction to the long post.
  5. Filter resolution in the SID is limited to 4 bit. That might not be "enough" compared to CV-Controlled filters, on the other hand that means that there is no need for A/Ds with higher resolution for the Filter (same for ADSR and volume, oscillator frequency has 16-bit resolution, PW 12 bit as I wrote in the longer post). Without deeper research in the bandwith-issue: At least one CV-in per SID with 4-bit resolution is possible. The Demoscene guys use the volume register to playback samples with those. Can the MBSID Drum engine use that technique?. Samples can also be played back using the filter registry. The limits of this technique on the C 64 was memory. Depending on the capabilitys of the PICs it might be possible to playback steady streams. This only works with the 6581. So if there is one CV-in with 4-bit A/D per SID, this gives at least 2 possibilities: 1. Controlling any control-parameter of the SID from an external CV-Source (that's already pretty close to the original idea). Besides the low resolution this might be affected by the "zipper" sound you mentioned and thus be not that interesting. 2. Maybe more interesting: The SID could be used as a soundprocessing effect. Just put any devie through the filter/volume-sample-playback and there might come out some interesting sounds. For the "patchbay" that would mean per 6581 SID: 1 (maybe more, have to find out) CV-input with 4-bit (maybe more for pitch or PW) A/D-converter to control parameters. 1 Audio input with 4-bit A/D converter for soundprocessign with a switch to use either the filter- or the volume-registers for playback 1 Audio output (already in the actual design) 1 Audio input to use the analogue Filter (Volume is also be applied)
  6. What do you mean by "performing sound generation"? With Cynthcard those paddle inputs can be used to control the filter in "real time". So to me it seems like register change commands are possible. I even think on the C 64 you can "poke" the converted input of the paddles anywhere, not only in the sound chip, but also to control sprites in the VIC or to write caracters or perform any other input for calculation in a programm. Do you mean that it depends on the other hardware that reads out the registers of the paddle A/Ds and then has to refeat it in another register in the SID? If that's the case there would be no "internal routing", but it woul not be worse than the input from any other device that is used to gather data that will be written into Registers of the SID "externaly" by the PIC? Even if the design of the MBSID is different to a C 64, the PICs should be possible to perform the same way, don't they? Reading this data out would cause more bandwith usage in the first place. So using an external A/D controller seems to be the way to go...
  7. OK, I read a bit in the original SID documentation and just wanted to share my thoughts with you. For the hardcore people this won't be news at all and maybe even full of faults... Due to the hybrid-design design of the SID semi-modularity is possible, but very limited and maybe totally senseless. To keep it simple I will only be talking about CV options, not gate (gate signals are digital anyway). A SID has a lot of parameters that seem to be desirable to be controlable by external sources via CV. Only digitally controllable via software are the following components: oscillators (1-3) (pitch + PW ) Amplifier (Amplitude Modulator controlled by Envelope Generator (ADSR)) (1-3) Filter (resonace) Volume Those could be controlled from external sources via patchcables and a CV/Midi-Interface. The MB SID V2 has 5 CV-Inputs, but there are 11 modulation options per SID. The theoretical maximum for a MB SID loaded with 8 SIDS would thus be 88 CV-ins! Fortunately the SID has already some kind of CV input. There are two A/D Converters for „paddles“. (Those do not seem to be used in the current design of the MB SID). Those work with +5 Volts and have 256 Steps (8 bit) internaly, which seems to be somewhat little, but is sufficient for most parameters as the control resolutions of most of the inputs show: oscillator pitch of the SID has 16 bit resolution PW has 12 bit (2048 = Square Wave). 16 Steps (4 bit) for all the remaining parameters. Inlcuding the 4 parameters of the envelope generator: Attack: non-linear fixed values not the same as Decay and Release Decay: non-linear fixed values, same as Release Sustain: linear but relative to A Release: non-linear fixed values, same as Decay filter resonance (linear steps from 0 to max) volume (linear steps 0 to max). For the 4-bit parameters the „paddle-inputs“ of the SID seem to make sense. The low resolution of most of the parameters show that the use of CV-Inputs for those is quite limited. If modulation via external analogue source is not necessary, all those parameters can be controlled via the SID CS or Midi, as it is already possible with the MB SID. Some additional Info: The output of the 3rd Oscillator (only the upper 8 bits) and the third envelope generator can be „read out“. This „reading out“ does not mean, that there is some kind of CV output, but it works by reading reading out the register. The data in the register seems to have a real analogue origin (if not the random generator could never work), but it can only be accessed after being stored in the register. This data seems to be usable for everything. In the documentation they mention: oscillator can be used as modulation generator (LFO) for the pitch or PW of the other oscillators, sample&hold, filter frequency modulation, vibrato etc. envelope Generator can be used filter frequency, oscillator frequency With MB CV it should be possible to use those outputs for CV-outs. But that does not seem to make that much sense... On the other hand the original documentation of the SID by Commodore suguests: „SID can process external audio signals allowing multiple SID chips to be daisychained or mixed in complex polyphonic systems“. The actual MBSID does only mixing, not daisychaining. But the latter should be possible by connecting the audio-output of one SID with the audio-input of another SID. But I haven't seen audio-inputs on MBSIDs, only outputs. There are 4 analogue Signalpaths in a SID: 1. Oscillator 1 → Amplitude Modulator 1 → Switch 1 (Filter or bypass) 2. Oscillator 2 → Amplitude Modulator 1 → Switch 2 (Filter or bypass) 3. Oscillator 3 → Amplitude Modulator 1 → Switch 3 (Filter or bypass) 4. Analogue Input All those are routed (the oscillators can bypass the filters via individual switches) through the same Filter (the SID has 4 different filter modes not 4 seperate Filters) and they all share a common Amplifier (Volume). So what could daisychaining different SIDs mean? Maybe copying the principe of an MS-20 filter section for processing an extenal signals? Audio Input SID1 → Filter (highpass) SID1 → Output SID1 → Input SID2 → Filter (lowpass) SID2 → Output SID 2 But as Filtermodes are additive, this could also be done much easier: Audio Input SID1 → Filter (highpass + lowpass) SID1 → Output SID1 Also splitting the different signals generated by one SID to use the filter of the second SID only on a part of the signal seems to be quite hard (maybe by an external frequency devider???) and not so usefull. Especially if more than 2 SIDs are available, because then those signals could simply be keept seperated by generating them on different SIDs. The more I think about the semi-modual MB SID, the more sceptical I get about the concept. Maybe I should get some sleep... Sorry for the typos though...
  8. As far as I know MB CV only has 8 CV outputs (and 8 gate outputs), but no inputs... MB CV V2 plannings do not seem to inclute CV inputs either. Via the expansion port of the MB-6582 it seems to be possible to connect a MB CV. Wilba wrote:"the idea was it gives the user the ability to connect AOUT modules or analog inputs (like a joystick or SoftPot)" But it seems to depend on the chosen option. So in some cases MIDI connection to the MB CV would be better. So MB SID + MB CV would give 5 CV Inputs + 8 CV outputs + 8 gate outputs. On one hand that seems to be pretty impressive, on the other hand this would all be software. In the end that would be more like iMS-20 with MS-20 Legacy Midi Controller than a "real" semi-modular. Maybe I just have to scrap the idea, because it would require a totally different and new layout.
  9. Would the use of the LPC17 core in V3 add more CV options?
  10. I can confirm that (running Ableton Live 8 under OSX 10.6.8 on MacBook Pro Core 2 duo 2.4Ghz). Sometimes the sound is wired, but when you select a new preset, it will play that one, not the wired sounding stuff.
  11. Also nach ein bischen rumsuchen stellt sich die Flohmarktsituation in Berlin für mich so dar: - Mauerpark: nichts (eigentich gar kein Flohmarkt, mehr Kleinkunst) - Kupfergraben (Museumsinsel): nichts, nichtmal in die Nähe von Computern, elektronische Geräte etc (es sei denn man zählt Telefone dazu) - Maibachufer: Polaroitfotoapparate etc. Eine Nintendo SNES. - Tiergarten: nichts; viel Kunst, ein bischen Bücher - Treptow Hallenflohmark: Viele alte Soundkarten (hab aber keine mit Yamaha chip drauf gesehen); ein Atari 2600; 2 Elektische Orgeln (eine davon "Electron"), viel Hi-Fi Zeug. Ein bischen Recording- und DJ-Kram (altes Tascam 4-Spurgerät; mehrer Mischpulte und Endstufen); keine C-64. Der Typ mit dem Atari meinte er hätte ab und zu welche. Den letzten hätte er (mit einem Haufen Spiele) für 50€ verkauft. Unter den Umständen denke ich, das eBay wohl immernoch die beste Möglichkeit ist, auch wenn man die paar Euro Porto drauflegen muss.
  12. Thanks, i did not know, that the LFOs used for the Matrix were software. Is the LFO section on the CCS also controlling those software LFOs or the LFOs on the ones in the SIDs? There is a vid on yourtube where some guy demonstrates a MDSID. Around 2:05 he says that it would have "three CV Inputs + expression pedal Input that can be assigned to pretty much any parameter". Is the expression pedal input possibily the "paddle input" of the SID? Is this the solution you were talking about? This is not standard, is it? The usual CV-options ( http://www.ucapps.de/midibox_sid_manual_cv.html ) include only the possibility to control external equipment via CV, but not to control the SID via external equipment?
  13. Is it possible to built a Korg MS-20 style MB SID? As the SID is mainly an hybrid design (digital control/analogue filters, ADRS) there do not seem to be too many options. After a look into the documentation (did not really understand anything, just trying to figure out what's written next to the pins) of the SID I only found: Audio In Audio Out POD X (for paddles) POD Y (for paddles) The matrix is used as internal patchbay, but I did not understand, if patching is only possible within the same SID or also between SIDs. If it is the latter, are those patch-connections analogue CV/signal or virtual? Aditionally there is the CV option for the MD SID, but as far as I understand this is only for controlling external analogue equipment and does not touch the Oscillators/Filters/Amplifiers of the SID itself. So to me it does not seem that it's possible to build a real (semi-)modular MBSID, although a look-alike might still be possible and nice looking... Is that correct?
  14. Bei eBay gibt es ja ne Menge defekte C64 aus denen man SIDs ziehen kann. Da kommt dann aber meistens noch Porto für da Päckchen drauf. Alternativ gibt es bei eBay "getestete" (taugen die was?) SIDs für knapp 20€. Gibt es in Berlin einen bestimmten Flohmarkt oder einen Laden, bei dem man günstig an alte Rechner rankommt?