I know many FM dedicated synthesizers from yamaha / korg doesnt have square waves.
yamaha v50, DX11, YS200, TX81Z, the Korg z3 guitar, ... wich uses (YM2414 FM chip) has dual LFO, eight channels and was also more expensive.
but doesnt have sqare waveforms.
how doest it sound? really square at the oscilloscope? tell me about please