I think I got it to work.
Got up to 15,000 bpm
When you say ultrafast mode are you taking about wide mode ?
no, i was referencing the vc-h1 visual communicator from kenwood.
it is an sstv camera/lcd screen/speaker mic.
when selecting FAST FM mode, a compatible kenwood uses flat audio.
if you’re getting 15k on your vara fm connection, you’re doing well and have surpassed the published ceiling of vara fm narrow.
sweet
kb0wlf