Hi!
Here is the design proposal for the discussion Torsten and I had over at
synt-DIY list regarding to Torstens request of a gate solution for the noisy
sid chip! It can be used to anything thats need a gate, volume, envelope,
“whatever” funktion, ie OPL3.
Torsten, does the MIOS today alow a user to adress one of the
software envelope generators to deliver the generated data to a
HC595?
If not i sugest you will make it possible in future updates! 
Reg
KD
The schematic can be downloaded from this location: http://www.midibox.org/users/kd/kd_fmsid.pdf
It shouldn’t be a problem to forward an envelope output to the shift register (ca. 1.5 uS execution time), is there somebody who wants to try this out?
Best Regards, Thorsten.
looks very interesting…
a kind of envelope follower as a kind of noisegate?
should work with a TL072 or TL082 as well… (?!)
found an mc1408 on my opl2 soundblaster… (8-bit dac)
my MBSID case is not closed by now…
breadboard…
interested.
Martin
HI:
I was planning to do a noise gate for my MIDIbox SID (a copy of a MXR Gate).
But now, I want to give a try to this one.
Could you please give some more info?
Where I have to conect this thing in the CORE, and how can I route a Env to it.
TIA
Sebo
This is not possible with MBSID V1, it will be possible with MBSID V2…
Best Regards, Thorsten.
Can the opamp be replaced with one that doesn’t require a negative supply, like an LM324?
It would be nice to use the same supply that’s in the MB-SID already.
I don’t know enough about audio signals… what is the voltage output of the SID module, including the protection buffer? If it swings either side of ground, then forget I said anything :-[
hi,
just a suggestion:
maybe it’s possible to do the gate with analog device ssm2404 quad audio switch.there are really “clickless”,
i’ve “breadboard” two of them and tested them with a DOUT (with no resistor) with success:
as you can see, the implementation is really simple: one stripboard, one chip and some resistors (and maybe some socket if you don’t want it looks like mine 
)
but maybe the “clickless” fonction will “break” the dynamic of the attack…from my side, my hear find they are enough fast to react…
at least this circuit could be used to add a “mute sid” fonction …
Can the opamp be replaced with one that doesn’t require a negative supply, like an LM324?
It would be nice to use the same supply that’s in the MB-SID already.
I don’t know enough about audio signals… what is the voltage output of the SID module, including the protection buffer? If it swings either side of ground, then forget I said anything
After the protection buffer is an offset of ca. 4V, so yes: it’s possible to use a LM324, but I’m not sure if it gives you the same results like a LF353
Best Regards, Thorsten.