Guitar and Drum Trainer - Version 4-RC1 Guitar and Drum Trainer is the ultimate musician's MP3 player to help increase practice time quality, improve playing faster and easier, or transcribe music. How Guitar and Drum Trainer helps: Slow down music to practice and learn at your own pace. Set loop points to practice difficult parts of a song easier. Pitch shift music to match your instrument's tuning. Use the GDT Speed Trainer to gradually increase music tempo to build accuracy and speed. A full wave and zoomed wave form let you see music you are playing along to. Zoom in to the second.