Garbled audio using ChanSpy Whisper playback into channel

I want to implement a “raise hand” functionality in ConfBridge by using dialplan_exec in a menu. I’ve Originated a call to a local channel, with ChanSpy Whisper, and bridged that to an extension, that should playback an audio file that says “Question from”, then say the last 2 digits of the users caller ID. It works with one problem:

Playing back the WAV file “Question from” is at about half speed and very garbled, but SayDigits plays just fine. The audio file is a standard 16-bit PCM WAV, created using Record(). Playing it back any other place in the dialplan doesn’t exhibit this behavior… It’s only when playing back using ChanSpy to the channel.

Any ideas?

Maybe try signed linear .sln ?

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