Memorize volume per channel

[DUN-Cosmos]

Since no channel has the same native sound volume.
We have to manually adjust the volume each time we switch channels to maintain a consistent sound level.
Sometimes, the volume is around 20% on one channel and 90% on another.

To prevent a sudden sound blast when switching from a channel at 90% to one at 20%.
It would be beneficial if the volume setting could be stored individually for each channel.