Want to repurpose Win 7 32 bit machine (no sound card) to use Audition 3.0

I was given a 32 bit Win 7 machine. It's dual core. It definitely runs Audition 3.0. I want to use it for just playing keyboards to a drum track for practice during the quarantine (and occassionaly writing a song or something). Definitely not for serious recording! In the past I used Audition 3.0 with a Win 7 32 bit machine quad core with a sound card and was very happy.

My problem: I'm hearing latency from the keyboard plugged directly in to the machine (not even using Audition). When I use Audition, there is SERIOUS latency.

My question: can I solve this problem by buying a sound card? Or how about a Behringer Xenyx Q502USB Mixer?

I do software, not hardware. Any advice would be greatly appreciated. Thanks!