TK.

Hallo Simon, vielleicht hilft diese Info weiter: http://www.midibox.org/forum/index.php?topic=9363.msg66977#msg66977 Gruss, Thorsten.

Hi, you are using 6581s, right? There is no real help, it's the VCA leackge issue, which cannot mute the oscillators completely. And yes, there are also variations between the SIDs, see http://www.midibox.org/forum/index.php?topic=9135.msg66996#msg66996 Best Regards, Thorsten.

Very good point. I've no experiences with photo MOS delays, but it looks like a 4066 w/o galvanical connection, which is good! Somebody has to try this on some real gear Btw.: according to the data sheet, the LED operating current is 1.4mA typical, and 3 mA maximum (not 50 mA) - thats even better :) Best Regards, Thorsten.

Yes, this is normal. In the first years Commodore optimized the chip production process, with the effect, that the SIDs - especially the filters - are sounding different. Also the leackage varied (high leackage -> hot chip). Only the newer 6582s and 8580s are sounding relatively equal, therefore (and also because of the better filters of course) this should be the prefered choice for stereo synths Here two samples for comparison: Two 6581 from calendar week 40/84 and 25/84 which sound very different: http://www.ucapps.de/mp3/midibox_sid/mbsidv2_filter_6581.mp3 Note that the filter characteristic is not linear, therefore a simple linear-based calibration doesn't really help here. Two 8580 (or to be correct: 6582) from the same batch (but my two 8580 sound equal to 6582) http://www.ucapps.de/mp3/midibox_sid/mbsidv2_filter_8580.mp3 Note also the silence at the end (nearly no background noise compared to 6581) Best Regards, Thorsten.

The handling of all incoming MIDI events is equal, but it sounds like your keyboard (or controller) sends CC over a different channel, is this correct? In this case you have to change the channel setup on your keyboard/controller Best Regards, Thorsten.

Der Master steuert natuerlich alle drei Slaves an. Du kannst das ueberpruefen, indem Du Dir die MIDI Meldungen anschaust, die vom Master bspw. waehrend eines Patch Changes gesendet werden. Selektiere mal SID4 und drehe auf der Hauptseite am Encoder - welche Meldungen werden gesendet? (mit MIDI-Ox laesst sich am einfachsten debuggen) Gruss, Thorsten.

When pressing two buttons the same time, you are switching between matrix and meter mode -> see changelog Best Regards, Thorsten.

Faster than the PIC can be clocked - the transfer speed is no issue here What are you planning to do exactly? Best Regards, Thorsten.

A T6963C is too slow for a MBLC - it could work, but due to the long access times there is a high chance for MIDI IN buffer overruns which cannot be avoided. See also the LCD benchmark: http://www.midibox.org/forum/index.php?topic=2169.0 I'm using a KS0108/KS0107 based GLCD, and it still works great! :) Best Regards, Thorsten.

Hi, did you handle the AC/ground lines with special care to avoid short circuits? It's for example important, that the PSU is not powered when you are soldering the cables. If not, propably the fuse has blown-up. I don't know the US version of the PSU, but on the EU version it can be easily replaced (there is screwable socket) Best Regards, Thorsten.

Hi, this is a low-performance T6963C based display - for what kind of MIDIbox are you planning to use it? Best Regards, Thorsten.

Great! :) Best Regards, Thorsten.

MIDI clock and SMPTE/MTC are two different things. There is no direct relation, as MIDI clock works step based, whereas SMPTE works timeframe based. See also http://www.borg.com/~jglatt/tech/midispec/seq.htm and http://www.borg.com/~jglatt/tech/mtc.htm Best Regards, Thorsten.

Hi, With MBSID V2 you cannot use joystick or pots the same way it was possible with MBSID V1, as the analog inputs are not handled by MIOS anymore, but directly scanned as analog modulation sources by the firmware. The rest of the panel is fine, but please consider that for MBSID V2 the labeling is slightly different. See also http://www.midibox.org/forum/index.php?topic=9040.0 And since there is enough place on your panel, you could add an 8th modulation line for "Vol" (below "Filter") Best Regards, Thorsten.

Hi matcom, it looks like there is a missing or bad connection between IC2 and IC3, see also the schematic http://www.ucapps.de/mbhp/mbhp_sid_v3.pdf You will see three control lines which are going to the SCLK, RCLK and SER input of the 74HC595. At least one of them seems to be faulty. You can check these signal lines visually, and/or with an ohmmeter when no ICs are connected Best Regards, Thorsten.

no, these are the flags for various hardware options (e.g. oscillator selection, brownout voltage, code protection). These two words should never be changed. The ID field is a number with 16 digits (8 bytes). It is "all-1" after erase, and if it won't be programmed, you will notice exactly the described effect. I just have downloaded WinPIC and searched for a possibility to change the ID field. It seems that the GUI doesn't allow this. But under "Device->Program ID locations" you can program it, propably with the values which are embedded in the .hex file (and in this file I've written the all-zero header) So, just try this function, hope that it helps. If not, the "TEST SW2" workaround of the MIDI troubleshooting page could help Best Regards, Thorsten.

Last week I've heard exactly the same noise on a MBSID - the reason was a bad soldering joint on the C1 cap (connected to pin 1/2 of the SID). So, it makes sense to check the C1/C2 cap connections Best Regards, Thorsten.

Yes, the only way is to add a second core module Best Regards, Thorsten.

Only one setup is stored within the internal EEPROM. BankSticks are not supported, only SysEx dump exchange. But it could be easily added, as storage accesses are already isolated in cv_bank.inc I think that all the imperfections in the handling make clear, that MBCV was only a quick hack I made for a friend. I don't use the MIDIbox CV by myself - the user interface would look really different if this would be the case. For example, I would replace the "select" button by two buttons for CV up/down. Cycling through the CV is very time consuming, I don't really like this handling (it was made to stay compatible to the MB64/MB64E menu navigation - but there is no real reason for doing it always the same way) Also the possibility to store multiple setups is an important point. Another missing but useful feature is the possibility to activate an interpolation for incoming 7bit CCs (it's like an envelope follower) to avoid steppiness and to get use of the full 12bit resolution. Best Regards, Thorsten.

Which faders are you using? The same issue exists for Mackie Control, but the reason is not the software, but the quality of the P&G motorfaders. The root cause is propably, that the resistance is not 100% linear over the travel. Addendum: ok, seems that you mean another issue - that the host software sets the motorfader to different positions for 0dB. I'm not aware of such an issue, but I'm a logic user ;) Best Regards, Thorsten.

Thank you very much, it's very nice to read, and a good basis for writing down new findings if required. On my homepage, I've replaced the PSU links by a link to the Wiki. I've also fixed some minor typos (the short name of capacitors is "cap") - thats the big advantage of the Wiki btw., errors can be easily corrected, extensions can be easily added by anybody. :) Best Regards, Thorsten.

Hi vattern, it looks like the wrong MIDI baudrate is selected. Maybe the ID header hasn't been programmed, or some bytes are swapped (see also http://www.midibox.org/dokuwiki/doku.php?id=jdm_with_winpic800) An "all-zero" ID is a save value Best Regards, Thorsten.

-> see http://www.ucapps.de/midibox_seq_changelog.html Have fun! :) Best Regards, Thorsten. P.S.: this release is intended as last release before I focus on MBSID V2. The TODO list is empty, and it can take a couple of months before I can consider new feature requests again.

(I'm currently extremely busy and therefore haven't answered to your PM yet) Some months ago I got a special request to specify +/- 12V instead of +/- 15V in the schematic, since transformers with +/-15V voltage range normaly output +/-18V effective voltage and higher when they are not loaded. And since (or even?) the OP amps don't load the circuit that much, the 7812/7912 got very hot. However, I see your point, and I think that a clear documentation is required here. Would you like to start a new Wiki page? Also a description (and schematic) of the one way rectifier circuit would be nice. (I never found the time to write down the details for all the variants, and I still think it makes sense that Users maintain such topics) Best Regards, Thorsten.

I like the PCD8544 because of the performance (see http://www.midibox.org/forum/index.php?topic=2169.0) and the possibility to service multiple displays from the LCD port of the core module (thanks to the serial lines) Best Regards, Thorsten.