Too-fast playback in Linn Kazoo

[struwwelpeter]

Bit of an odd one here (I'm sure it's not a MinimServer issue, but Linn have closed their forums, so I can't post there), so I'm hoping someone's come across it before.

I've got a Synology NAS running the latest MinimServer and MinimStreamer, this is going to a Mac (Mojave 10.14.1) with the OpenHomeAFS codec running Linn Kazoo. I'm using stream.transcode (with the stock Synology ffmpeg) set to *.L16

When I try to play a track I get no sound and the playback progress indicator moves at about 5x speed.

Playback from other control points and renderers (Android:BubbleUPnP, Roberts DAB radio etc.) is fine.