KEY_NAV1_VOLUME_SET / KEY_NAV2_VOLUME_SET - Only 0 or 100 values

I’m attempting to use the KEY_NAV1_VOLUME_SET / KEY_NAV2_VOLUME_SET events to
control the NAV radio volumes via a WASM gauge but it’s only possible to set
them to 0 or 100, no values in between. The COM volume events work fine. Can
anyone else confirm that bug? The KEY_NAV1_VOLUME_SET_EX1 /
KEY_NAV2_VOLUME_SET_EX1 events work correctly.

Even at max volume (100), the audio level is very low, - far below the COM
radio volume. Is the Morse Code an audio recording, or is it generated
programmatically ? What can be done by Asobo or the developer to increase this
Nav Audio level ?

Hello I confirm this behavior. NAV_VOLUME_SET returns 0 or 100 only