The previous version was designed for a single IC-705. But as I use two of them there is an issue when doing CW: You will not hear the CW sidetone on transmit. In combination with HEO satellites and delays on downlink it is almost impossible to do CW. So the box was recreated and a second audio input was added. Here is the schematics:
Besides just the second input there is also a quad switch was added which allows to switch between separated audio (i.e. on TRX on the left ear, the other on the right) and combined (both audio signals mixed to both both ears). This lets you either monitor two frequiencies or mix the sidetone of CW to the RX signal of satellites.
The prototype is working but still needs some printed labels to the connectors.