I had previously downloaded the demo iPad version but hadn't had a chance to try it then. Last week I was out of town visiting relatives in Toronto and was asked to play music at a large family party. They had a Roland FP-60 for me to use, but I figured I'd be able to add the accompaniment with the OMB. When I connected it with USB-MIDI, I experienced an issue with latency, which seemed to be over half a second. A bigger issue was that the OMB would play half-tone higher than the keys I press on the keyboard, e.g. if I press a E chord, the OMB plays F-chord, or playing a D would produce a D# sound from the OMB.

I emailed Jos Maas, and he kindly replied to me with suggestions to try to reduce the latency. However, he said that the half-tone issue would be fixed in a software update later this month (which wouldn't be soon enough for me).

I ended up playing piano-only (realizing how rusty I was, but also seeing how much improvement a week of practice can bring), to very positive feedback.

Since I already have an iPad, the OMB software is a very small incremental cost and a useful tool to add accompaniments when solo playing accompaniment-less instruments, or as a portable system with a small controller. I will be looking forward to buying the updated version with the semi-tone issue fixed.