SG01 Series
AKAI SG01 Series are GM-based PCM synthesizers. SG01v has 'vintage' sound sets, and SG01p is a piano module. They all share the same architecture.
AKAI SG01v (1995)
AKAI SG01p (1995)
Guessing from the 32 polyphony and the digital resonant filter, SG01 Series may be related to AKAI's 2nd generation S Series sampler, such as S2000.
AKAI S2000 (1995)
Many lowest GM synths used filter-less PCM playbacker like CASIO GZ-50M. Later ones used synth engines that emulate Roland SoundCanvas, which has a resonant filter. GS SoundCanvas has more complex parameters than SG01, though limited - matrix modulation like polyphonic aftertouch with LFO rate, etc. is editable.
SG01's strictly NRPN-based editaility was rather a rare strategy in the GM world. One related example may be Hammond GM1000. GM1000 has also very simple NRPN-based parameters. It has many organ short-loop samples and 'Leslie' imitated by a digital chorus.
Hammond GM1000 (1994)
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SG01k
Deep Synthesis: Home10. 23. 2005