Professional Sound Cards?

[SteveD]

I am trying to find a high quality sound card with 1/4" inputs and outputs. I have tried the Maya 44 and Echo Mia Midi cards. They both sound way better than a Sound Blaster 24 bit card with 1/8" inputs and outputs. The problem is that with both these 1/4" input/output boards I get problems trying to import a singers disc while playing another singers song. Both cards cause the singers song to warble while importing customers song.

I have tried every possible sound card setting to reduce or eliminate this problem. Has anyone out there had good success with any 1/4" input/output sound card, and if so which ones?