In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

UPDATE :
The current SX Keyphone design has failed due to a few reasons, especially 

1.  Sound quality is not good enough.
Even a single bit error in the software ADC causes unacceptable background noise. ( like TV without any tuned channel ).

2. Mechanical Relay sparks causing some instability in the execution of the SX processor.

We have abandoned the "record and play on the fly" concept and now have changed to a "2 analog bus" concept.
We have revised the circuit design for Version 2 and will be posting the new design in this forum very soon.

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