ENSONIQ SQ-R is a PCM synth with unique waveform modulation capability called Transwave.
It's a descendant of the legendary VFX series, which are the first Transwave synthesizer.
ENSONIQ SQ-R (1990)
I made an SQ-R editor for Emagic SoundDiver
that better supports the later versions like SQ-R plus 32 voice.
To use my editor, you need SoundDiver.
See the links below for detailed info, downloads, and .mp3 sound examples.
* Ensoniq released many versions of SQ-R series,
and also released SQ-80, a completely different synthesizer before them.
To simplify the matter, here I use "SQ" and "SQ-R"
as representative of the newer SQ-R series that excludes SQ-80.