I don't currently use JRiver and it may not be my solution. Unfortunately, there does not seem to be any way to contact it directly. I hope this works.
I have used Pure Vinyl/Music for years, to digitize LPs. I do this at 192kHz and bookmark the tracks in iTunes. Now I have a problem. I bought a DAC that shows up on my Mac as only capable of 96kHz although it is supposed to downsample 192 to 96. However, when PM sees 96 it downsamples but when it does this it can only play from disk and bookmarks require playing from memory.
Each LP is stored as a single CAF file of about 2Gb. The bookmarks, which are stored as m4a files, point to locations in the file where tracks begin and end. I need a piece of software that can play the 192kHz file directly or downsample it to 96kHz, output it to my DAC AND use the bookmarks or some other method to access individual tracks. Is this possible in JRver?