Are there better ways to apply audio gain and mixing?

[SmithGoll]

Describe the feature

The clipping issue in Sonivox is extremely severe.
The vast majority of cases occur during the final mixing and audio gain application stages.
It is possible that replace current mix and gain implement to prevent clipping and improve audio quality?

[rsp4jack]

Hi,
Could you please describe what "the final mixing and audio gain application stages" refer to?

About the clipping issue:
After EmbeddedSynth/sonivox-fork#80, the output of WT and FM synth, which is 16-bit full scale (1.0 = 2^16-1), is mixed into a 32-bit mixing buffer (still 16-bit full scale), and then mixed down to 16-bit output buffer.
Reducing the volume should help. But a probable better way is to output a 32-bit buffer with 16-bit full scale directly from the mixing buffer, or simply a float buffer, so that peaks over 1.0 are not clipped.

WT synth output 16-bit values to the mixing buffer because WT synth never apply gain over +0dBFS to the sample. FM synth outputs 32-bit values with 16-bit full scale, which is made in EmbeddedSynth/sonivox-fork#101.

[SmithGoll]

But a probable better way is to output a 32-bit buffer with 16-bit full scale directly from the mixing buffer.

It sounds good to prevent clipping, but can it really be achieved?

[rsp4jack]

A obstacle is the effect. Effects supports only EAS_PCM, which is 16-bit.