{
vector<SyncSource> ret;
- ret.push_back (JACK);
+ boost::shared_ptr<AudioBackend> backend = AudioEngine::instance()->current_backend();
+ if (backend && backend->name() == "JACK") {
+ ret.push_back (Engine);
+ }
+
ret.push_back (MTC);
ret.push_back (MIDIClock);
ret.push_back (LTC);