I placed a synth patch in a track in Biab and at first I had sound. Now I have no sound but see the signal in the mixer. I tried a different patch but still no sound. Suggestions?

We need more details to understand your issue :

- On what track did you put the synth sound (bass track, piano piano,...) ?

- Is it a GM patch or a Hi-Bank Patch ?

- Is your song full MIDI or do you have also some RT's ?
Other MIDI tracks sound OK or not ?

- What synth do you use (external expander, VSTi, DXi,..) ?

Please dis-regard. I was trying to replace the guitar track with a midi sink but the guitar was a real track. ALthough, I could have sworn I was getting the synth sound initially. Senior moment.

Glad you fix it yourself !