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widdly

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widdly last won the day on November 17 2014

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About widdly

  • Birthday 01/01/1

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MIDIbox Newbie

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  1. I excited too. Adrians cases are the best. I've got a Shruthi and PreenFM with them and they are easily my best looking synths.
  2. I am building a module that takes an analog CV and converts it to a midi message. I am connecting the CV via a 1K resistor to an AIN input with a diode clamp to protect against over/under voltage. I am using Banana cables so when no signal is connected the AIN inputs are floating and will produce randon results. My solution is to connect a 1M resistor to GND on each input. Is this the correct way of doing this? My other question is with regards to the schematic here... http://www.ucapps.de/midibox_ext/lfo/lfo_schematic.pdf The diode clamp is using 1n4148 diodes so the PIC pin will get -0.7 to 5.7. But the datasheet quotes -0.3 to 5.3 as being safe. Is it ok to use 1n4148 with a PIC or would it be better to use a BAT48 or similar that would limit the voltage closer to the datasheet range?
  3. Lemur is out on Android now. :smile:
  4. Yep I'd love one. I spent the weekend soldering up the front panel PCB for a midibox seq and was planning on ordering a set of your panels. A wooden case would be pimp! Also nice job on the LXR. I was just looking at it on the Sonic Potions site. The LXR is an awesome machine.
  5. I'd like to join a group buy for a case for an LPC SEQ4. Anyone got an update?
  6. widdly

    USB Host?

    Unfortunately it's in japanese but this site is the one I was thinking of. It's based of the USBhostlite examples. http://www.rjblog.net/archives/2009/e000331.php translated... http://translate.google.com.sg/translate?hl=en&sl=ja&u=http://www.rjblog.net/archives/2009/e000331.php&ei=K5S8TtuDMKWH4gTO_ISABA&sa=X&oi=translate&ct=result&resnum=1&ved=0CB8Q7gEwAA&prev=/search%3Fq%3Dhttp://www.rjblog.net/archives/2009/e000331.php%26hl%3Den%26biw%3D1366%26bih%3D704%26prmd%3Dimvns There is source code included. The source code has a parser for the usb descriptors, checking if they are audio devices with midi streaming. Usbhostlite has an interrupt and a blocking function Host_ProcessTD that fills a buffer from the USB port. Other than the first byte, the buffer is written straight to a serial midi port. The example doesn't have any hotplugging implementation other than exiting if the midi usb is disconnected. There is a description of the first byte content in the USB midi spec, on page 16... http://www.usb.org/developers/devclass_docs/midi10.pdf I'm not sure on the hardware side but perhaps this post might be helpful in setting up the physical USB host port on the LPC1768... http://knowledgebase.nxp.com/showthread.php?t=2064 I would think class compliant USB-midi support would be the way to go. I imagine support for custom stuff would be a nightmare. Although support for the novation launchpad would be a neat way to add a BLM without all the soldering. edit.. Actually looking more closely at the code from the japanese site, it doesn't look quite right. The MIDI_ParseConfiguration function is never called. I'm guessing he must have modified the usbhostlite function Host_EnumDev to call MIDI_ParseConfiguration instead of MS_ParseConfiguration.
  7. widdly

    USB Host?

    Is it possible to add USB host support on the LPC17? I've seen some other LPC based projects on the web that have midi usb host features. I think the seq4lite would be great with one of those usb only mini keyboards like the akai lpk25.
  8. widdly

    Test fit (with flash)

    Looks awesome. what are the dimensions?
  9. The midiboxFM is a very different synth to the FM8 despite both being FM. The things labelled A-B-C-D-E-F in the FM8 square matrix thing on the advanced page are the operators. It's like an oscillator and an envelope combined. The matrix in FM8 lets you setup any combination of Operators you want where as the OPL3 has only 4 preset routings. FM8 also has a filter and a wave shaper ( G and H on the matrix). FM8 envelopes are very sophisticated, they have unlimited breakpoints, tempo sync and can be used as LFO's as well as operators. Additionally there are two tempo synce LFO's in FM8. The OPL3 built in envelopes are quite limited with only a small range for the adjustments. TK has implemented an additional Envelope and two LFO's in the MidiboxFM which can tempo sync. The MidiboxFM has a wavetable sequencer that is pretty unique and doesn't have an equivalent on the FM8. I like the Midibox FM for bass sounds (similiar to the famous lately bass), percussion clicks and blips and for weird fx. I wouldn't use it for e-piano sounds because of the 4ops and limited op ratios. Pads and soundscapes are do able and they tend to sound lofi and glitchy.
  10. Getting the CV's in the range 0-5 involves using a voltage divider (2 resistors). The problem with the Doepfer is that the ADSR, LFO and the resonance in the filter are not voltage controlled. If I was doing this, I'd implement the modulation sources inside the Midibox and have the modulation matrix in digital. It would be a lot less electronics and would allow you to do cool stuff like midi sync on the LFO's. I'd go with 8 CV's out of the AOut NG controlling Osc1_Pitch, Osc1_PWM, Osc2_Pitch, Osc2_PWM, Osc2_Level, Cut, Res and Amplitude. You could use CMOS analog switches to control other parts. I like the DG series switches ..http://www.intersil.com/products/deviceinfo.asp?pn=DG411 You can use these to switch analogue signals using a DOUT pin. The different wave shapes of VCO's could be selected with one of these chips. The sync signals could be switched with these. The second VCO signal could be switched to mix with the VCO1 or to frequency modulate either VC01 or the VCF. You would need two VCO's, two VCA's, and a VCF. For the VCO's I'd look at the Hearn Morley ones here...http://sites.google.com/site/hearnmorley/synth-diy-resources or the prebuilt pcb's from here..http://mattsonminimodular.com/
  11. You could build a GM-5 interface since you have 5 devices it would be perfect. It's a 5 in/out usb midi interface that is cheaper than anything else out there. You can set it up so the midi port names match the devices they are connected too. So when you are using say Ableton Live you select "Roland JV-2080" instead of "midibox gm-5 port 2". It's pretty ace.
  12. I'll take 8 of those if there are enough left.
  13. I've also noticed what looks like a bug. The Instrument assign numbers in the AOut menu show the values 5,6,7 and 8 instead of 1,2,3 and 4.
  14. It looks like AOut offset is part of the ensemble not the instrument. I've found it's better to leave the offset at -63 and use the AOut depth in EG5 to sweep the filter.
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