Update rtosc submodule - zynaddsubfx - ZynAddSubFX open source synthesizer

commit 696a83d076299e1107280224fe448977df228311
parent e1090f3f3b8403da2cdaf1ed6a9aa5f68d2da14b
Author: fundamental <mark.d.mccurry@gmail.com>
Date:   Sat, 25 May 2019 09:51:34 -0400

Update rtosc submodule

Should fix NRPN support

	zynaddsubfx ZynAddSubFX open source synthesizer
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