I started this thread, and now that I have received my WIDI Masters by CME Audio, I thought I would post a report; Right out of the box the Widi Master paired automatically with my Quicco Sound mi.1 Bluetooth MIDI transmitter plugged into the Roland FR4x and started working very well. I didn't notice any latency. I think it's a very inexpensive, elegant, and effective way to connect your accordion or for that matter any other MIDI controller with a MIDI din out (as long as it powers the WM) to any other MIDI devices with a MIDI din out(for power) and MIDI din in - all wireless without involving a PC or IOS device. The beauty of the Widi Master is that not only will it work with other brand Bluetooth midi devices, but it will also connect legacy midi devices together without any additional device such as PC or iPad. A very minimal setup. The mi.1 is so small that it is always plugged into my Roland digital accordions in and out of the case. Years ago, someone on the Roland accordion forum installed a WIDI x8 wireless midi system by CME Audio inside his FR7 and made the schematics available. Also, a very talented forum member here did all types of neat modifications to his Roland accordion. I don't have the skill, and oce I hired a technician to undo some major proprietary features in my reedless accordion. The 9 pin serial port was done away with, small rechargeable batteries installed in the reedless, and a MIDI jack. Now, I can use the WIDI Master to make the reedless a totally wireless midi system and connect to just about any other module/arranger once again without the need for a PC or iPad. Just now, I fired up the Korg Microkey Bluetooth MIDi keyboard controller. It paired with the Widi Master on my Yamaha module right away and began to play. How cool is that?