fix information message
info: improve channel out-of-bounds message
specify package path fx() -> ::fx()
locally disable uninitialized warning
better background colors
suppress uninitialized warning
Revert "disable sync_effect_parameters() for troubleshooting"

This reverts commit e5cbfefd1d60e9295cad68b125442d3c149fa76e.

The function ensures that any changes to Ecasound effect
parameters during the engine run (possibly caused by a
MIDI controller using -km) are reflected in Nama's
fx parameter data.
comment