[PROBLEM] Camilladsp "failed to open audio output"

[nosferatu_cat]

I've been trying to set up quick convolution on Moode 8.3.6.  I'm using convolution files created in Cavern, because I wanted to start with something simple.  I've set up what I think is a faithful copy of the included convolution filters.  I've  set the sample rate to 48KHz to match the IR files.  

When I try to play a file I get an mpd error whose short text is "exception: Failed to open audio output."  The ALSA output is the HAT I'm using configured specifically as the default output.  It's shown correctly (dev 0,0) in the Camilladsp configuration.   I can supply the complete configuration if it would help.   Log file extract below.

Code:

Oct 19 08:06 : exception: Failed to open audio output
2023-10-19 15:06:42.205081 INFO [src/bin.rs:711] CamillaDSP version 1.0.3
2023-10-19 15:06:42.205436 INFO [src/bin.rs:712] Running on linux, aarch64
thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: Imaginary parts of both first and last values were non-zero.', src/fftconv.rs:150:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
2023-10-19 15:06:42.289176 ERROR [src/alsadevice.rs:553] Message channel error: receiving on a closed channel
2023-10-19 15:06:42.289440 INFO [src/filedevice.rs:497] Processing thread has already stopped.
2023-10-19 15:06:42.289590 ERROR [src/bin.rs:344] Playback error: receiving on a closed channel
Oct 19 08:06 : output: Failed to play on "ALSA Default" (alsa): snd_pcm_poll_descriptors_revents() failed: No such device
no pid file present!
ALSA lib libasound_module_pcm_cdsp.c:869:(cdsp_hw_free) Error executing camilla_exit_cmd /usr/local/bin/cdspstorevolume

Oct 19 08:06 : exception: Failed to open audio output