The list below provides solutions to some of the most common tech support issues. If you are having problems with your Tetra and suspect that operator error might be to blame, resetting the Global parameters is a good place to start. To do that, hold down the Program Mode button to access the Global menu, scroll to Reset Globals, and press Write. That sets the Global parameters back to their factory defaults. (There is no full hardware reset built in, but the factory programs are available for download if you want to get everything back to the original state.)
If one of the analog waveshapes sounds strange or if the filter is not behaving as expected, you may also want to try running the calibration routine. This is not something you should have to do regularly (or ever, really) and has no effect on the oscillator tuning. To run the calibration routine, hold down Assign Parameters and press the Mode button.
One channel is louder than the other.
Use the Balance parameter in the Global menu to adjust the left/right balance of each voice. If the individual voice balance controls do not appear in the Global menu, update your OS.
The sequencer and arpeggiator have stopped working.
Make sure the MIDI Clock setting in the Global menu is set to Internal. If it is set to MIDI In or MIDI In/Out, the sequencer and arpeggiator will only play if a MIDI clock is present at the MIDI input.
Some of the programs don't sound the same as they did.
I'm hearing some clipping distortion in some of the factory programs. Is my Tetra broken?
Probably not. There are many sources of gain in Tetra. If they are set to high levels, you might hear some distortion under the right circumstances. We try our best to make sure that doesn't happen on the factory programs, but we're never going to be able to predict just how someone else will decide to use them (which is part of the fun of making synthesizers). Start by reducing the Amp Envelope Amount.