Thanks. I've downloaded it and at first glance, it does offer a lot.
I've already hit an error though. On the second attempt at playing the Mullingar Races (chosen as a tune I'm familiar with as a starting sample) and having changed the view (and perhaps also requested the tune a second time). I'm getting "Failed to write C:\Program Files\Harmony\T0000001000.mid". It then works for me if I hit "retry".
.. looking further into this as I'm typing here... It seems it occurs when I try to re-play a midi that is already playing... (something I'm quite likely to do) If that is the case, maybe a MIDI "stop" and deletion of old file could save a minor annoyance.