As mentioned above, I've ordered 100 Mini-PCBs, although only 76 have been requested yet - means: there will be some spares!
The Mini-PCB is the best solution if you are planning to integrate an USB interface into a PIC based MIDIbox, resp. if you want to upgrade a device which doesn't natively support USB-MIDI:
A GM5x5x5 is nice-to-have if you want to connect multiple synths to a single interface with common MIDI cables, please consider that this means that you also need two MIDI cables per device for bidirectional communication.
With a Mini-USB (integrated into the device) you would only need one USB cable connected to the device (just leave out the DIN sockets and directly solder the "MIDI pins" together) - and you could optionally use USB as power supply in some cases (not for MBSID, not for MBFM since the power supply has to deliver more than 5V)
It's also possible to control up to 5 MIDI devices through a Mini PCB if the digital IOs (at TTL level) are directly connected to J6!
So, I hope that the remaining Mini PCBs are sold as well, otherwise I've to increase the price of the PCBs to compensate the money loss.
Best Regards, Thorsten.