External HD Changing the quality of the sound?

so BitPerfect auto-select the memory cash?

cache* sorry

Yeap. BitPerfect (click on the little logo on the top right of the menu bar. Select Preferences. You can adjust the size of the cache obviously limited by the RAM installed but RAM is cheap these days. Our old 2011 iMac already had 4x4GB RAM

Doggiehowser - I am just doing some pre-lim exploration of computer audio...and, in another thread, noted your enthusiasm for a set up that sounds somewhat like mine. Hope you can provide additional insight and guidance here about use of Bitperfect.

If I purchase Bitperfect do I need to install it on my external hard drive where my iTunes music library (and iTunes) resides or will it work properly with iTunes (which is operating from the external hard drive) if BitPerfect is simply downloaded to the MacBook Air hard drive? Hope that is not too ignorant a question.

System is: iTunes & Apple Lossless Files on SeaGate 1TB ext. H/D>>MB Air>> USB out>>M/F V-Link>>M/F DAC>>Pre-amp.

Thanks in advance for your help.

BitPerfect is an app that works alongside iTunes. You use iTunes to manage your library (set which HDD to keep the library in etc, add new songs, add metadata info if needed, create playlists etc).

BitPerfect just takes over the playback engine from iTunes. You install it from the App Store like with most new apps. It will be in the Applications folder.