saugns v0.4.8c. Fix minor bug, refactoring. Fix v0.4.8b bug which gave junk results when a 0 Hz oscillator has an `f` modulator with `r` frequency ratio. (Normally useless, but valid in scripts.) Was due to use of uninitialized data for that specific case only. This script made noise with the buggy v0.4.8b, is correctly silent now: `W f0[W r10 a1000] t10`