I had no problems with my delta 44 card - good resale value too - bought for 150 from turnkey, sold for 110 on ebay just recently...One of the most stable configurations I had was a Delta 44 for audio and a Soundblaster Live card doing the midi in/out. It worked fine, no conflicts. USB midi interface was a nightmare though.
Is it a PCMCIA card? Remember Laptops have hardly any electro magnetic shielding and all the parts are VERY tightly packed together. I would have thought any internal card runs the risk of suffering interference from this. The average PC has the same problem (If I put my sound card by my graphics card i get some horrific noise for example) but the parts are spread out in the case that much better so it is less of an issue. I would have thought an external card would always be better as you seperate the sound device from the source of the interference ...Im trying to get hold of an echo card for a lappy but the guys at the store tell me that with a Lappy FSB 800 you get nasty hi freq digital distortion, anyone know why that is??? coz they dont!