In 1991, it was followed by the SY99, a successor that cost ~$4000/£3000 and expanded its capabilities with a 76-key keyboard, the ability to load user-specified samples for AWM, a more advanced effects unit, and other features.

The SY/TG series also features Yamaha's now-flagship Advanced Wave Memory 2 (AWM2) technology for playback and manipulation of PCM samples, an evolution of the AWM included earlier in their TX16W.

These technologies, both alone and in combination (the latter giving rise to the name Realtime Convolution and Modulation), can generate rich, layered, multi-timbral sounds, and there are large libraries of patches available for the SY77.

However, the SY77 and SY99 were the last Yamaha "flagship" workstations to be natively capable of the fully fledged FM synthesis that had been introduced with the DX line.

The Montage has an AWM2 engine, the same found in the Motif series, With the ability to import custom samples to the internal flashrom like the SY99.

It also has the same resonant filters found in contemporary Motif synths, as well as a complex modulation interface that includes an envelope follower, motion sequencer and more.