OtsAV has three prerecorded scratch samples already stored in the F9 - F11 hot-key positions.
Play your favorite Ots file.
Press a key between F9 and F11 to hear the scratch sample.
Tip: If you want to ascertain an exact deck to scratch on, use the Left Shift for Deck A, and Right Shift for Deck B, in conjunction with the F9 - F12 key, e.g. Right Shift + F10 key will scratch Deck B with the F10 sampled scratch.
How to record a scratch sample