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DAC2 HD on HiFiBerryOs Spotify volume jumps to 100% when it should be 0%

I'm using the DAC2HD kit that comes with HiFiBerryOs preinstalled.

When playing a Spotify stream, if I use my phone to lower the volume, everything works fine until you hit 0% volume, at which point the volume jumps up to 100%.

If I run Spotify from my desktop computer, adjusting the volume in the Spotify app has the same issue at 0%.

If I adjust the volume using the HiFiBerryOs web page, this issue does not occur.

Here's my amixer output:
# amixer
Simple mixer control 'DSPVolume',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 255 [100%]
Front Right: 255 [100%]
Simple mixer control 'DAC',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 240
Mono:
Front Left: Playback 204 [85%] [-18.00dB]
Front Right: Playback 204 [85%] [-18.00dB]
Simple mixer control 'DAC Invert Output',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'DAC Rolloff Filter',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [off]
Simple mixer control 'Softvol',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 255
Front Left: 255 [100%]
Front Right: 255 [100%]

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