Bradge... a bit of history for you to think about..
In 1987 the "Dream" chip was designed and produced by a company I believe from France (Dream). A lot of "ahead of it's time" manufacturers used this in expensive sound chip.
I would question the "first to use PCM sounds".. Roland used PCM in the 1985 release of Sound Canvas.. It was 24 voice polyphonic... where most where at 6, 8, and the massive 16 voice (DX7).
Sound Canvas developed to 28 voice, then 64 voice, 128 voice and 256 voice.
The Lionstracs MediaStation (80's, 90's) used the "Dream" chip as the basic sound source.. but the premium sound source was Giga sample.
The Dream Chip was a bit noisy.
Just something to think about..