Sendspin on Pi doesnt allow fixed usb hardware name, relies on USB number

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#112 opened on Feb 7, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: linux, python, raspberry-pi
Domain: audio-video-rtc, cli, operating-systems

Research direction

Start by tracing how the sendspin daemon handles --audio-device and compare that with the device names shown by aplay -l. Reproduce the service configuration using /etc/asound.conf and the sendspin.service override, including a USB device reorder. Done means the named USB audio device remains usable after reordering and the service starts successfully.

Written by the indexing model from the issue text.

Description

I have a soundblade installed via usb to Pi P400, its currently usb device 3.

I have the following configuration in /etc/asound.conf as the soundblade only accepts 48khz:

pcm.upsampler {
    type plug
    slave.pcm "softvol"
    # The 'plug' plugin is the only one that understands the 'rate' field
    slave.rate 48000
}

pcm.softvol {
    type softvol
    slave {
        pcm "hw:3,0"
    }
    control {
        name "Master"
        card 3
    }
}

pcm.!default {
    type copy
    slave.pcm "upsampler"
}

In sudo systemctl edit sendspin.service

[Service]
User=sendspin
Group=audio

ExecStart=
ExecStart=/home/sendspin/.local/bin/sendspin daemon --audio-device=upsampler
Restart=on-failure
RestartSec=5

# No ExecStartPost - no timeout issues
ExecStopPost=/usr/bin/pkill -u sendspin sendspin

While this works, its not robust enough to survive a new USB device inserted, using the name of the device in aplay -l , causes an error and the service doesnt load.

Aplay -l ouput:

card 3: SOUNDBLADE [BLUEANT SOUNDBLADE], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Dominant language: Python
Stars: 190
Forks: 36
Avg merge: 11d 19h
Merged PRs (30d): 2

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