Ensure float operations in SoundSynthesizerEffects. #347

Job	Run time
ubuntu-20.04, gcc 7-2017-q4, cmake 3.6.0	44s
ubuntu-20.04, gcc 7-2017-q4, cmake latest	55s
ubuntu-20.04, gcc latest, cmake 3.6.0	53s
ubuntu-20.04, gcc latest, cmake latest	58s
macos-12, gcc 7-2017-q4, cmake 3.6.0	1m 19s
macos-12, gcc 7-2017-q4, cmake latest	1m 22s
macos-12, gcc latest, cmake 3.6.0	1m 24s
macos-12, gcc latest, cmake latest	1m 30s
windows-2019, gcc 7-2017-q4, cmake 3.6.0	1m 58s
windows-2019, gcc 7-2017-q4, cmake latest	2m 2s
windows-2019, gcc latest, cmake 3.6.0	1m 55s
windows-2019, gcc latest, cmake latest	3m 41s
	18m 41s

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