Are there any internal adjustments that can be made to the sounds of the 777?

Yes - the Flying Pan originally had 4 trimpots that were factory-calibrated, and three of these are 'exposed' on the 777 when the base of the pedal is removed to allow more adventurous users to experiment with different settings. One trimpot is for adjusting the centre of the phase sweep, whilst the other two are for adjusting the depth of the tremolo effect on the left and right channels. No damage can be caused by making these adjustments, even at each extreme, and a default calibration setting is marked clearly so you can return your unit to 'as-built specification' if you wish.