You'll get the best results with our libraries if a high quality external audio interface is used along with its audio drivers. For Mac users, the on-board audio usually works fine, and because the Mac OS uses the low latency Core Audio driver the on-board audio offers good quality and low latency. For Windows users, you'll need to use an ASIO driver for low latency as the MME and WASAPI drivers in Windows aren't suitable for virtual instruments and have more latency. External audio interfaces will come with their own ASIO drivers, but if you want to use your on-board audio output, we recommend the free ASIO4ALL driver found at asio4all.com.
A sample rate of 44.1kHz will give the best results. Since the library is delivered at 44.1kHz, using other sample rates will require resampling which uses additional CPU resources. If you're using our libraries in your DAW and need other sample rates, this is perfectly acceptable. But for standalone use, we recommend a sample rate of 44.1kHz.