sonicrings4 seems to have looked into this already, so maybe it'd be easier to sit out their reply.
The OST weighs in at 187 tracks. Checking the 233 streamed sound files in the game, the distribution is as follows:
orchestra (+ vocal) = 70
orchestra + synth = 7
vocal = 3
vocal + synth = 1
synth = 152
Give or take as there are surely duplicates. Add to that some sequenced music (1-34 "Bazaar", 2-01 "Battle" and maybe a few others) to get the final number of the synth tracks. But you can see that they went all in with the orchestra after Super Mario Galaxy.
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