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<TITLE>Re: [sdiy] Paia MV-8 MIDI CV Processor request for info</TITLE>
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Hi.<BR>
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I built a MIDI2CV8 a while back, and have been pleased with it. I can recommend adding a few additional circuits on a bit of perfboard though. <BR>
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The pitch wheel centres at +5V (+5.33V on my board), with 0V at the bottom and just over 10V at the top. It's well worth fitting an offset /scaler circuit on the PB output, so that 0V is the "off" or centre position.<BR>
All of the continuous controller outputs are stepped, or "zippery" if left with 0 to +10V range. There is a little diagram in the Paia construction manual showing how to get the pitch bend range down to a more musically useful range - doing this removes perceivable zipper noise. I wired my PB output to one sub-circuit giving a fixed ±2 semitones, and to another one with a pot for range, with a DPDT switch selecting between the two. Both had the offset set with multiturn trimmers.<BR>
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To get rid of zipper noise on the other CV outputs (e.g. in mode 1 you have Mod Wheel and Aftertouch CVs), use a simple lag circuit on the output of each, with the rate set so that when controlling, say, VCF cutoff, there is no audible zippering, but it has an acceptable control response. In practice, the slight control lag hasn't been a problem.<BR>
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It might be worth replacing the DAC trimmer with a multi-turn one, although fitting it to the board might be tricky for space/footprint reasons. <BR>
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cheers,<BR>
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Dave<BR>
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on 9/3/06 22:07, megaohm at megaohm1@gmail.com wrote:<BR>
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<BLOCKQUOTE>Hi,<BR>
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I just picked up a Paia MV-8 and I'm looking for documentation, schematics, any info, tips , and/or links. Any and all help will be greatly appreciated.<BR>
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Thanks,<BR>
peng<BR>
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