The one feature I envy about the Ultimate products is their ability to mimic the 1541 disk drive sounds. Of course part of it is nostalgia, but I've also realized that the disk drive sounds actually play a significant part of the UX. It's very common for C64 games or programs to have a "press a key to continue" message, and the only immediate feedback you get when you press a key is the sound of the disk drive spinning up. And although the TC64 does replicate the disk drive light, it is often obscured for me by the buttons or the computer depending on where I'm sitting, and it would be so much better if there was sound too.
I'm guessing that it's infeasible due to memory/FPGA limitations to pipe audio samples of a disk drive into the TC64 audio output.
But I was wondering if it would be possible to have a mode that causes a real 1541 disk drive plugged into the TC64 IEC port to mimic the sounds/light/motor movements of the simulated drive in the FPGA without actually reading or writing any data? Then the sounds of the disk drive would be reproduced with perfect fidelity.