[...] Secondly, I would like to confirm that my Bank knob is actually accessing every sound sample. My test patch for this is TOPOGRAF TRIG 1 -> each DRUMKIT channel, one by one -> DRUMKIT OUT -> MIXER 4-4 A1 channel -> I/O port 2 -> to Fostex recorder and speakers. No other synth lines are patched.
Here are the results of that test patch. Format: LINE: # of samples played from rotating Bank from fully-left to fully-right; knob positions of samples (knob range, in percent, from left to right).
BD: 1 sample, full knob rotation. SD: 3 unique samples; Sample A (0-40), B (40-65), C (60-75), B (75-100). CP: 3 unique samples; Sample D (0-25), E (25-50), F (50-57), D (57-70), E (70-100). CH: 2 unique samples; Sample G (0-30), H (30-42), G (42-53), H (53-75), G (75-100). OH: 4 unique samples; Sample I (0-51), J (51-62), K (62-72), L (72-82), K (82-100). FX: zero unique samples (all sound identical to previous samples but the whining from the module is hurting me and I can't listen anymore); all spread out accessibly but heavily front-loaded.
[...]
The arrangement of the samples look fine; basically, the DRUMKIT module has only 11 different samples, that are assigned in different combinations by the bank knob. No space for more samples in the used chip...
mine is fixed now too. wasn't pretty melted the plastic on the outs and almost lost the 23 but its done and the modulation on the pitch cv is ok now and the volume cancellation through the faders gone too......to my ears anyway. thankyou very much.
First, my sincere apologies for the nasty issue with the DRUMKIT010 and even more for the long period of silence from my side. I almost can't believe it is two years ago this thread has started! For some reasons I lost this problem out of sight *shame*
Ok, now let's go for fixing the issue; two different ways:
1 - The DIY way:
The output filter, that blocks the PWM carrier frequency (this is what you hear) can be modified by adding a capacitor of 1nF across R23, at the top left side of the board, see here:
The value of the capacitor can be changed; choosing a larger one (e.g. 2.2nF) makes the filtering stronger (at the cost of loosing more higher freuqency components), a smaller one (e.g. 470pF) leaves more of the highs intact, but with less filtering of the nasty carrier frequency. If there are already manual modifications made on your module, please PM me so we can check it in detail.
2 - The tangible waves support way:
If soldering is not yours, you can send us the module of course for fixing the issue without cost, no matter when it was purchased.
Some more background info:
The (annoying) carrier frequency changes with the settings of the pitch knob from 15kHz to 30kHz, and this four times over the turning range of the pitch knob. So you have a much higher "noise pitch" e.g. a bit left of the middle position and here, the PWM carier frequency should be out of the hearing range - maybe worth a try!
Soon after this issue came up, I was planning an updated version of the DRUMKIT010 module, with a real digital-to-analog converter avoiding the PWM noise; unfortunately, the last period of time brought some unpleasant surprises, consuming a lot of time to deal with, therefore I lost this issue out of sight, honestly. But the updated DRUMKIT is still on my list and I hope I can get it done in the second half of this year.
Does this issue still exist on drum modules purchased currently? What does an updated module mean?
My duty was always to booty and that was my crime.
mine is fixed now too. wasn't pretty melted the plastic on the outs and almost lost the 23 but its done and the modulation on the pitch cv is ok now and the volume cancellation through the faders gone too......to my ears anyway. thankyou very much.
Not the nicest job - r23 didn't make the cut on mine... I should probably check that will be ok.
mine is fixed now too. wasn't pretty melted the plastic on the outs and almost lost the 23 but its done and the modulation on the pitch cv is ok now and the volume cancellation through the faders gone too......to my ears anyway. thankyou very much.
Not the nicest job - r23 didn't make the cut on mine... I should probably check that will be ok.
Bugger, Yeah I found out quickly it should have been a fast solder
I almost can't believe it is two years ago this thread has started! For some reasons I lost this problem out of sight *shame*