Midi tracks not muting

It’s been a while since I’ve used the OT sequencer as I usually use the Sub 37 sequencer so it may be something simple I’m doing wrong here but when using the OT to sequence an external synth, the mute button does nothing, the synth keeps receiving the midi seq. Without having to spend ages digging through the OT manual can anyone tell me if this is something simple I’m missing or a bug?

A post was merged into an existing topic: Midi Mute