Hi larry k - Thanks. Are you on a Mac? My RB doesn't have that little button on the bottom right. I'm on Windows 7. Anyway, I got to where you were ultimately pointing through preferences and made sure that speakers are highlighted and moved to the top to make them the default midi out devices. No change. I pushed the default MME button on preferences/audio, too, just in case.

I went back and re-installed SampleTank, this time using the default file locations instead of a location on my Dropbox. The synth panel configuration window now shows many more instruments so I must have messed something up in the first installation. The bad news is that it still doesn't play in RB and it took a step backwards, too. I used to be able to hear sounds when in the synth panel if I had RB set to AISO. Now that doesn't work, anymore.

I also experimented with the changing the track in the sampletank synth panel. The track I'm testing is Track #4, midi channel 3. I've tried putting the desired synth on both tracks 3 and 4 and also on track 1 in the sampletank synth panel and it makes no difference.

I ran the DX diagnostics tool in "options" on the sampletank synth panel and everything checked out.

???