works

.gitignore

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+/.venv

main.py

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+#!/home/ardent/virtualenvs/kroqnroll/bin/python3
+
+from pulsectl import Pulse
+import sys
+
+with Pulse('kroq-volume') as pulse:
+    inputs = pulse.sink_input_list()
+
+    inputs = [input for input in inputs if "nrsc5" in input.name]
+    if len(inputs) < 1 or len(sys.argv) < 2:
+        sys.exit(0)
+    kroq = inputs[0]
+    vol = kroq.volume.value_flat
+    command = sys.argv[1].strip()
+
+    if command == "up":
+        vol = vol + 0.1
+        vol = min(vol, 1.0)
+    if command == "down":
+        vol = vol - 0.1
+        vol = max(vol, 0.0)
+    if command == "mute":
+        kroq.mute = not kroq.mute
+
+    kroq.volume.value_flat = vol
+    
+    pulse.sink_input_mute(kroq.index, kroq.mute)
+    pulse.volume_set(kroq, kroq.volume)

requirements.txt

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+pulsectl==23.5.2