Enable snd_seq
Music tools such as fluidsynth require snd_seq, which currently is not included. For example,
> FluidSynth runtime version 2.1.8
> Copyright (C) 2000-2021 Peter Hanappe and others.
> Distributed under the LGPL license.
> SoundFont(R) is a registered trademark of E-mu Systems, Inc.
>
> Parameter 'chpn_op10_e01.mid' not a SoundFont or MIDI file or error occurred identifying it.
> ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No such file or directory
> fluidsynth: error: Error opening ALSA sequencer
> Failed to create the MIDI thread; no MIDI input
Also see manjaro-arm/issues/pinephone/phosh#37 (closed)
and https://github.com/dreemurrs-embedded/Pine64-Arch/commit/a1d107605b80669bd63477eeaa86b70499471ad7