Hi Dan,   The unit now just stays in standby mode even after removing all power (and reconnecting), trigger input etc.   Not too concerned as it is only a few days old and under warranty - more an inconvenience than anything else.   Using the 298 as a test bed to see if this type of amplification is suitable for my speakers and worth pursuing either by adding another 298 or upgrading to M33  - time will tell.   When it is / was working, I found it to be a