The TB-03 has a knob labelled 'CUT OFF FREQ'. I assume it´s a cut-off filter because Roland´s manual describes this knob as 'Filter cutoff (brightness of the sound)':
The Allen&Heath Xone 4D mixer has a filter called 'Low-pass filter':
When I turn both knobs it seems to me that they do the same thing: they filter out the high frequencies and pass the low frequencies.
Therefore my question: What is the difference between a low-pass filter and a cut-off filter?
Note: I think there is no difference. I think the term 'cutoff' refers to the point where Low-pass and High-pass filters begin to cut off the frequency.