SOUNDRIVE / COVOX ports on original ZX Spectrum

[VELESOFT]

I see last version of SOUNDRIVE 1.6. But only some ports are usable on orig.ZX Spectrum 128 computers thanks to incomplete adressation of AY ports and 7FFD/1FFD ports.

With real ZX128 is usable only this ports:
- original SOUNDRIVE ports #0F,1F,4F,5F
- COVOX port #FB
- PROFI ports #3F,#5F
- port #7B ( I mean for this port not exist software support )

Czech D/A software (UR-4 ports) support this ports #1F(left channel A), #3F(right channel B), #5F(middle channel C). This three channels are mixed as ACB stereo (similar as AY channel mixing). Then channel C is mixed in left and right channels.

I plan add support of SOUNDRIVE and Czech ports to my new interface.
Exist software support for PROFI ports #3F,#5F and for port #7B ?
I plan for mono covox port #FB use both channels, because sound only in one channel is not so good...
For Czech ACB D/A stereo I will also send middle channel C to both channels.

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