STEPS TO REPRODUCE 1. guix shell festival 2. echo Hello speech | festival --tts EXPECTED RESULT You can hear festival utters "Hello speech". UNEXPECTED RESULT There is no speech, and the following error is printed: Linux: can't open /dev/dsp ADDITIONAL INFORMATION Using flite, a synthesizer based on festival, just works. Also, following the steps in Debian produce the expected result. SYSTEM INFORMATION OS: Guix System f52719dfad7b7d3beb2b1211b6846196f3590823 x86_64 Kernel: 5.13.15-gnu1 --- Luis Felipe López Acevedo https://luis-felipe.gitlab.io/