I use state of the art software so there will be no artifacts if the target Key is near the original Key. There will be some quality loss when these Keys are far from each other.
You have a backing track but can't sing it because the key is too high or too low. I can transpose the song to your desired key and you will be the star of the party!
IMPORTANT: Please send me the audio file (or link to download it) and target Key (or transposition amount in semitones) for an evaluation and demo - free of charge - before placing the order.