I have done a lot more research on this problem and have been going through the posts on the M Audio Forums as well.

What I can see from a few other people having the same hassles is that it seems to be a Windows 7 64 bit problem. The other posters all are running this version of the OS.

What makes it even harder to work out is that even though I'm running the 64bit version of X1 and X2, the problem only seems to occur on X2. It is an intermittent problem though so that also clouds the issue. I can say that I've just had a band in the studio for a week doing tracking and I ran with X1 for the session. I had absolutely no hassles.

I can get X2 to reproduce the problem fairly easily though.

I'm not saying that the problem is with X2. It just seems to happen when I'm using X2. Maybe I've just been lucky with X1.

I'm starting to think that this is a driver issue which has come out only in the Windows 7 64bit driver. I've also contacted M Audio but had no response. I know that these Delta 1010s are getting a bit old now and support is slowly disappearing. I realise that I should start looking for another multiple input interface but there doesn't seem to be a lot of choice unless you want to spend fairly large sums of money. I need 16 ins and preferably all on one interface.

M Audio is selling another interface with 8 ins and 8 outs but it works via firewire and I'm not sure if that is the way to go.

Alternatively, it would be really nice if M Audio would just respond, look into this and maybe come up with some new drivers that actually work.

I have switched to WDM to see if that makes any difference but it's gonna have to be short term because the latency with WDM is terrible.

I see that someone else on the forum is having the same issue as I am and is also using Windows 7 64 bit.

I will keep you posted.

Cheers,

Peter.