Have the issue you are describing. Streaming through a Marantz receiver that has HEOS. Can adjust volume using receiver controls, or on the ipad using either HEOS app or the Marantz app. The volume difference from song to song can be dramatic...example, needing to turn one song up to level 50 and next down to level 35. Just not acceptable when wanting background music. Don't want to have to adjust every song. Maybe your algorithms need to include similar recording volume when selecting music. If you are using a Replay Gain factor, seems that would mean you already have a data value for recording volume and attempting to adjust. It's not working.
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