First of all, I wouldn't call it an organ. It certainly can sound like an organ, but it does not have organ functionality or intent at all. It is an organ in the same way that any divide-down synthesizer can "sound like an organ." A person specifically looking for an organ would find the divide-down section of the MG-1 as un-organ-like as others seem to find it un-synthesizer-like.
While it utterly lacks organ functionality, it has some very very basic synthesizer functionality. It can be fully affected by the filter and anything that affects the filter... envelope, LFO, etc. In the same way as any paraphonic divide-down synth, it is possible to play it using filter effects in a way that very basically says "synthesizer."
What no one talks about, sadly, is the fact that when you add the monophonic oscillators in the mix with the divide-down section, it sounds even more like a synthesizer than it did. Something about the presence and sound of the monophonic oscillators sort of tricks your ear into thinking you're hearing chords in THAT sound instead of merely a divide-down square wave. Especially when you've got a lot of modulation and portamento, etc. going on.
It is also misleading to separate the polyphonic and monophonic sections. It is perfectly possible to play monophonically in the polyphonic mode... and let me tell you that it adds a lot to the sound of the MG-1. That makes it a THREE OSCILLATOR synth with detune for all three oscillators! It makes a big sound! Especially when you've got the three oscs involved detuned, you've got monophonic osc pitch modulation going, AND portamento. While the portamento and osc modulation does not affect the polyphonic section, the stable pitch of the polyphonic section against the modulation of the two oscs as well as the pitch variances from the portamento make a really impressive sound.
The biggest setback regarding the polyphonic section is that they did not connect the "release" control of the envelope (to the VCA) to the polyphonic section. As a result, there is simply no sustaining the polysection without holding the keys down. Boo! Weirdly, the the attack of the VCA envelope CAN be used with the poly section... but you have to be very deliberate about it.
Ugh. I need to stop typing about it and just MAKE A VIDEO.
"I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." -Charles Babbage
"Unity and Mediocrity are forever in bed together." -Zane W. http://www.youtube.com/automaticgainsay