SWAY – a synth modeled after the Yamaha SY77 – Page 31 – Instruments Forum

I don’t understand what you mean. I have both the TG77 and the SY99, and I didn’t understand what is your point. The synth configuration allows voices (presets) with ONE element (which can be either AFM or AWM), with two elements (which can be either 1 AFM + 1 AWM, or 2 AWM or 2 AFM), and FOUR elements (these are special and can only be stored in Bank D) which can be either 2 AFM + 2 AWM, 4 AFM or 4 AWM. So, you can have as many AWM elements as you want in a voice, depending on the configuration you choose. No need to “replace” anything – in fact what you can always do is replace the configuration (between one of the possibilities listed above).

The important thing (if that’s what you are referring, but I’m not sure from what you wrote), and what makes the SY series a completely different beast, way ahead of its time, is that when you have an AWM element, you can route that waveform as a waveform into one of the operator of the AFM element (which Yamaha called RCM – Realtime Convolution and Modulation).