BIAB 2012. 11.5 Everything Pack. Sonar 8.5, SB Audigy card,Intel Celeron E3400 @2.60Ghz, RAM2gb,Windows XP Pro SP3

Hi Everyone, A few months ago my PC had the mobo & Hard drive replaced. Prior to that, my BIAB & Sonar seemed to work together well,..... since then, I posted about latency problems, which have worsened.
I normally import RealTracks....Bass/Drums/Guitar/Piano,sometimes Mandolin/Harmonica. I then do live Guitar, Banjo, Vocals, Harmony.
Now, when I try to record ANY live track.....Crackling in the cans starts about bar 80 then worsens. And playback is out of sync. I can't use the metronome to record.......but it's OK on playback, as is the sync.
On the advice of "guru" who usually can sort things........I changed the tracks to Mono....made a global Audio change to 16 bit depth for everything....buffer is at max 340.....created a bus for effects and pointed tracks to it, ......still can't record! I know a previous suggestion was that the Audigy card wasn't capable.......but before the mobo was replaced it seemed to cope...and at that time I had plug-ins on several tracks, and all the Real Tracks were in Stereo! Can anyone assist....or do I definitely need a new card?.....or AM I missing something I should be doing? Joe G.

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