You can use JRiver for file conversion.
Select the FLAC files you want to convert in JRiver.
On the JRiver Menu select Tools > Library Tools > Convert Format. The Convert Format window will open at the bottom of the left sidebar.
Select FLAC Encoder (unless you prefer an AIFF or WAV with no metadata tags)
Click the Encoder Settings button
Select 0 compression level (largest file/fastest decoding)
Click the Options Link
Choose Destination file folder
Select Mode (Leave original file and choose whether or not to add back to library)
Under Audio Options check Apply DSP
Click DSP Settings
Select Output Format checkbox on left side
Change Channels dropdown to 1 channel (mono)
Close DSP Studio and click OK on Audio Conversion Options dialog
Click the Convert button in the Convert Format window in left sidebar
I would edit the filename or song name tag of the converted files with the suffix "(Mono)"
Steve
