Interest during the last few months is very sparse on the TM-710A Keyboard adapter. I haven't' put much work into it since I've found other options. I do not plan on doing any more kits for this board at this time. This is a option for anyone that did not complete an initial build.
The concept used on the board is to drive the normal mic with a AVR chip and emulate the mic on the TM-710 board which is controlled by the AVR. Software will have to be completed to come up with something useful and this design may not be perfect. I have used this board and the previous OSW board in my mobile setup for a long time without any issues but have switched to using a SSD based PC.
If you have any suggestions, changes, or bugs; please submit those back.