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easyeffects
Limiter, compressor, convolver, equalizer and auto volume and many other plugins for PipeWire applications
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pamidicontrol
A utility to control the volume of PulseAudio streams / sinks / sources with a midi device
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If that is not what you are looking for, give EastEffects a look for the effects part.
I've stumbled across solarnz/pamidicontrol, which is "a utility to control the volume of PulseAudio streams / sinks / sources with a midi device".
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.