Use up arrow key ↑ to increase warp. Use down arrow key ↓ to decrease warp. If you are wearing headphones, I ADVISE YOU TO REMOVE THEM IMMEDIATELY. Sorry, the warp SFX are loud, but you can't have a good game without loud SFX, right?
Credit to Eugene "Gene" Roddenberry for creating the original Star Trek TV series. All sound effect made be me. If you want to know how I made my sound effects, you can just ask me on my profile.