The mumble plugin gets location updates stepwise.
On the border of the radio horizon (or reception range due to power) this makes the signal quality change in steps. This is excaberated by the fact that signal quality is evaluated just once per recived audio packet
Signal quality is the driver for the noise/signal ratio and tuhs volumes of noise and voice channels.

We could make the audio receiving code (mumble_onAudioSourceFetched hook) interpolate between the last signal quality for the ongoing audio packet, for the given user/radio combo and the current one.
This should be happening just for ongoing receptions, not for the first sample in a given transmission.

Sample count and sample rate can be used to calculate the duration of the packet in seconds.