vintagestar Posted August 4, 2010 Report Share Posted August 4, 2010 (edited) Hi, I have finish building the sammichSID last week. Finally, I found out it's the USB <-> Midi cable's problem. I have install a sound blaster card in my computer and use that midi, the upload works finally. Anyway, I have put two MOS 6581 in the synth. However, there is several patches sound volume is quite low. Is the chip filter broken? P.S A016 Filtered Poly / A017 Filt Mono Pad / A022 Filtered B 6581 / A023 Filtered B 8580 / A044 Turntable / A048 Helicopters...etc I can hear them, but the sound volume is lower than other patches Regards, vintagestar Edited August 4, 2010 by vintagestar Quote Link to comment Share on other sites More sharing options...
Digineural Posted August 4, 2010 Report Share Posted August 4, 2010 (edited) I think its briefly mentioned in somewhere in the lead engine documents that the 6581 has a defect ...the same sequence played on a 6581 - you will notice, that some mixed waveforms don't work on this older SID. And note especially the background noise, which is produced by a leackage issue in the VCA/mixer section but under the FAQ it also states: [13] Some mixed oscillator waveforms don't output a sound Thats normal on a 6581, it works on a 6582/8580 - see also the demo samples in the Lead Engine chapter Honestly, I've been able to compensate for issues with the 6581 on my MB6582 by changing a few parameters to get a similar (and by no means exactly the same) sound or I just dont use the patch at all. If its a huge concern, maybe you can grab a 6582 or 8580 and swap out some parts in the sammichSID. Edited August 4, 2010 by Digineural Quote Link to comment Share on other sites More sharing options...
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