Update RELEASENOTES.md

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-Version 3.0d23 – Development Version
+Version 3.0d24 – Development Version
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 Version 3 is a big update -- please see below.
 
 **New Feature**
-* Add a new setting, for advanced users only, in the `general` section. Use the `interface` setting to allow you to specify the interface on which to provide the AirPlay service. Omit the setting to get the default, which is to choose the interfaces automatically.
+* Set Max Volume. Add a new setting, for advanced users only, in the `general` section. Use the `volume_max_db` setting to allow you to specify the maximum level to set on the hardware mixer (if chosen) or the built-in software mixer otherwise. The software mixer's range is 0.0 dB to -96.1 dB. The setting must be a number with a decimal point, e.g. 21.3.
+
+Version 3.0d23 – Development Version
+----
+
+**New Feature**
+* Choose Interface. Add a new setting, for advanced users only, in the `general` section. Use the `interface` setting to allow you to specify the interface on which to provide the AirPlay service. Omit the setting to get the default, which is to choose the interfaces automatically.
 
 Version 3.0d22 – Development Version
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