TRK (Filter1 Keytrack) lets the cutoff frequency follow the pitch of the sound played. A setting of 32 will make the filter track the oscillator frequency in note intervals, making it possible to play the Filter 1 resonance the same way as an oscillator is played.
I’ve tested this on two devices (A4 and AK) and this doesn’t seem to be true for filter 1. Filter 2 tracks the pitch correctly (afaikt), but filter 1 is really off especially in the lower regions. It can barely do 1 octave correctly, so it is not really possible to play the filter as a sine-wave oscillator.
Try turning down the oscillators and put the resonance to max for filter one and set the tracking to 32.
Playing filter 2 as an oscillator gives some really nice results also in combination with filter 1 and the regular oscillators I only wish filter 1 could track as good. O well.