Motherboard PCIE question

Probably simple but basically can I use a sound card that is PCIE 1 in a PCIE 4 slot.

I have an ASUS P6T Deluxe v2 x58 mobo and I have a PCIE slot that is designated as PCIEX4_1.
I currently have on board sound but recently was given some sweet adobe cs6 audition software and would like to insert a card so that I can work my software hard. It is capable of 5 track recording and saves in wave PCM format. Sooo if I were to buy a PCIE 1 card could I use it in that PCIE 4 slot? Just want to make sure I don't mess anything up. I look forward to anybody that can help me out on this one. Thank you in advance and if you are reading this and cannot help no worries have an awesome day. Oh and if you can help please have a great day as well.