The RSCL machine (Rimshot Classic) contains two oscillators, each with its one Tune control (T1, T2). The third parameter controls (BAL) the balance between these two oscillators.
What’s weird is that turning BAL all the way anti-clockwise (-64) results in Osc2 being audible only, while turning it all the way clockwise (+63) results in Osc1 being audible only.
Give the order of the Tune controls, you’d expect this to be the other way round.