SOUNDRIVE / COVOX ports on original ZX Spectrum

[VELESOFT]

Can I see the schematic diagram of this device?

Today I read some threads about SOUNDRIVE development in last years.
Schematic of version 1.6 is in attachment, but I don't know if it's exist as real device, or only this schematic. Also SounDrive_TLC7528 is nice :-)

I plan use CPLD based project with very small D/A convertors (2x 10 bit stereo chip) connected on SPI bus.

I read also latest table of ZX ports with all known D/A ports.
Now my idea is update my webpage and add all existing ZX software for D/A chips and all convert also to standart COVOX/SOUNDRIVE ports.

Profi ports supports in Sample Tracker 2.1 by OLDMAN as "stereo covox" option.

If exist only some pieces of software for PROFI stereo D/A then I can rewrite D/A ports in software and not support old PROFI ports.