Razmo

And now that we are talking about the SID 6581 filter... I fiddled about with the filter on the 6581 one time ago, and found that the problem with it is that the register value for fully open filter, and fully closed filter varies from chip to chip... maybe on one chip the fully open filter is at 0, and on others another value... with this in mind, it should be possible to better the function of "defect" chips by making a callibration routine... a routine that makes you (by ear) listen for the max closed/open filter settings, and then note down these values.... these values could then be used in the filter routines for scaling in between these too values... usually, the values above/below these two points in the full filter cut-off range are "dead ranges" with no apparent change in sound... at least that is what I've noticed... this would require some significant changes to the filter engine of MB SID, but should pose no real compatibility issues i think... as long as the callibration is selectable in the patch itself. Regards, Jess D. Skov-Nielsen

OK!... and this AOut is specificly for the MB SID? ... The point was, that the envelope should be directly controllable from within a SID Patch, otherwise it would be worthless when sharing patches with others i think... People are anoyed by the SID filter!? :o ... well, is the filter not the sole reason for people wanting to get nostalgic with the SID!? ??? ... I know that the 6581 filter is quirky, but is that not the nice thing about it?... well... guess it's not up to me to decide, but for me, routing the SID sound around it's internal filter for processing through another seems well... funny :D... you could say the same about an extra amp envelope created the way I suggest of course... guess it's basically the same, but for me, what makes the SID sound different from the rest is the filter... hmmm... In any circumstance, if any of my idears are to circumstancial, then at least the option of routing an envelope to the volume register would be nice... for fast snappy basslines, this works pretty nice even though the vol register has only 16 positions. Regards, Jess D. Skov-Nielsen.

Hi everyone! :) I finaly had my MB SID finished, and are now playin' around with making some patches for it. One of the things i HATE about the SID (both 8580, 6581 & 6582A) is that bloody envelope bug (know it gives it that SID SOUND, but... i HATE it nonetheless ;D). I find that all patches I make end up having ADSR settings of 0,0,15,0 which is one of the only settings that does not give you that sloppy attack feeling on the sounds... that bugs me! ::)... So I thought; What if an "artificial" amp envelope was developed?... One that takes the final output and amps it by software?... of course this would require some additional hardware (that i'd be happe to include just to get better amp control! ;D)... but then I also thought: The C64 was capable of playing 8-bit samples using the volume register... could this perhaps be done in software?... what about VERY rapid dithering of the volume register? ... possible?... Thorsten? Well... I know that the 6581 has noisy vol register ´switching, so that's possibly out of the question... but what about the 8580? I recall having routed an envelope to the volume register on an 8580 in my own old C64 SID synth project with great success (with fast decays! otherwise steppings was clearly audible!) believe the best result would be the make a dedicated DCA of some kind, but is that possible with the MB SID? One of the cool things either a software dithering mechanism or a hardware DCA would give us, would be to make really snappy percussive sounds (especially with the Curve feature, that I came up with once 8) ), and also, the noisy oscillators of the 6581 SIDs would be eliminated by this trick. Regards, Jess D. Skov-Nielsen Denmark.