Convert to Apple Lossless using different bitrates?
I occasionally use the "convert to..." function in iTunes 12 to convert wav files to apple lossless. Previously this has resulted in 44.1khz files which my Sonos system can play without any problem. Yesterday, however, it converted files at 96khz, which Sonos recognises but plays back incorrectly - they sound as if they are being played at half speed (or perhaps even less).
There doesn't appear to be any way to change the sample rate in iTunes so does anyone know why this might have happened and if there's any way to go back to 44.1khz sampling?