diff --git a/roles/pi_musicmouse/files/config-musicdolphin.yml b/roles/pi_musicmouse/files/config-musicdolphin.yml
index 4301e7e..b493f82 100644
--- a/roles/pi_musicmouse/files/config-musicdolphin.yml
+++ b/roles/pi_musicmouse/files/config-musicdolphin.yml
@@ -1,14 +1,13 @@
 ---
-# musicdolphin: display-only instance. No physical mouse attached, so serial and audio
-# are both "simulate" - the web front-end (shown locally in the pi_kiosk Firefox window,
-# and reachable on the LAN for a tablet) is a complete way to drive the player on its
-# own. `figures` still needs at least one entry (the schema requires it) even though
-# nothing will ever scan a tag here.
+# musicdolphin: screen-driven instance. No physical mouse is attached, so serial stays
+# "simulate" and the web front-end (shown locally in the pi_kiosk Firefox window, and
+# reachable on the LAN for a tablet) is how the player is driven. `figures` still needs
+# at least one entry (the schema requires it) even though nothing will ever scan a tag
+# here.
 #
-# This Pi does have a HifiBerry amp (mediapi_has_hifiberry_amp, alsa_card_name
-# sndrpihifiberry), so the `softvol_effects` slot from pi_alsasetup exists on it.
-# Swapping alsa_device to that is the one-line change that gives this instance real
-# sound - the amp is currently shared by squeezelite and shairport only.
+# Audio goes out the HifiBerry amp, the same way musicmouse does it: pi_alsasetup's
+# `softvol_effects` slot is a softvol control feeding dmix, so the backend shares the
+# card with squeezelite and shairport rather than locking it.
 #
 # Unknown keys are rejected rather than ignored, so a typo fails at startup with the
 # path to the offending line. Every key is documented in the app repo's
@@ -31,7 +30,7 @@ general:
   # asked for, so a config that lost a line fails loudly instead of booting into
   # something that looks like it is working. Startup says so every boot.
   serial_port: "simulate"
-  alsa_device: "simulate"
+  alsa_device: "softvol_effects"
 
   web:
     host: "0.0.0.0"
@@ -78,10 +77,12 @@ general:
   # (no mouse), kept so the file reads the same as the other hosts'.
   button_leds_brightness: 0.5
 
-  # Volume, 0..100. The full range: this one is driven from a screen, not from a knob a
-  # child can spin, so there is nothing to protect against.
-  min_volume: 0
-  max_volume: 100
+  # Volume, 0..100, clamped the way musicmouse clamps it: below ~23 the softvol
+  # attenuation leaves nothing audible, and the ceiling is there so no UI slider can
+  # put the amp to full. These two numbers are tuned to musicmouse's speakers, so
+  # expect to want different ones for this room.
+  min_volume: 23
+  max_volume: 70
   initial_volume: 40
   volume_increment: 5