I am violin teacher and I use and recommend this app a great deal. However, there is one thing I would really love if the developers would consider (which would make this a 5-star review) and that is a way to adjust speed percentages by + or - 1 with the tap of a +-1 button just like you can with moving forward or backward in seconds. I would also love love love if you could either modify the small movements back & fwd or have more options available to do so (e.g. 5, 10, 15 seconds.) It would also be out of this world if you could develop place markers or tabs for points of difficulty that you could just jump to go practice. E.g. One at 1:36, one at 2:30, one at 14:53, etc. (Also would be great for jumping to the next movement in classical music).That being said I will continue to use this app and hammer on the << or >> 1 second button until this feature (hopefully) comes out. I haven't tried other similar apps (if they exist) but this one has been great to me, so am true blue all the way. Highly recommended. Get it.

More than worth the price! Truly a game changer! I tried cheaper options and their interface looked more interesting, but those looks were deceiving. Those others were difficult to effectively manage and really buggy. ASD proved to be “amazingly” intuitive, easy to organize what you’re learning, and completely bug free. You do have to “own” your iTunes music that is imported, and they have to be downloaded to your device—Apple won’t let you work in other programs with their music otherwise. I do pay for Apple Music, so I have to individually purchase those pieces I decide to accompany on my banjo. But that is a very small added cost for the time ASD saves when learning the song. Besides having quick and easy control of pitch and speed, the setting of focused sections of songs is very easy—I was setting focused loops on the fly the first night of practice using ASD. Each loop only took seconds to create and are automatically organized under a disc looking icon linked to the song. Having the loops organized with each song like that is one of the many details that make using ASD intuitive and effective. I do not typically leave reviews—less than a half dozen made in my lifetime across all platforms—so this review is a sign of how impressive and helpful this app truly is. Thanks for this great product!

This app consistently crashes. Even as we speak I’m trying to play a song on it because I have a show Saturday and have a bunch of songs with key changes to learn, but have to keep pulling up the app and let it tell me numerous times it failed to play the song. Or it just won’t do anything when I select a song to play. One of the only times I can “practice” is when I run in the morning. It’s been a huge headache. It will get through a song, not move onto the next, I’ll have to stop and totally interrupt the flow of everything, open the phone, try to get the next song to play, half the time it still won’t play and I’ll actually have to restart the entire phone to get it working again, when other normal music apps will just keep playing through each song. I don’t think it’s worth the money I paid. I have never bought an app this expensive and don’t like the fact that it crashes, freezes, and doesn’t work right. If it was a free app, I wouldn’t care as much because I didn’t have to pay for it. But $15? I’d almost rather get my money back, but conversely I need a way to practice these songs with the key changes and this is the only app I know of that can accommodate. If there is an option to actually download the playlists with their changes to avoid all this that I’m not seeing, forgive me. But I’ve searched and don’t see anything like that here.

Great for slowing down difficult percussion passages. Some distortion is present at very slow speeds, but it's still completely workable. Didn't read all other reviews, but if you come across a "protected" file that won't import - there's a way around that too.————-Checking back in on this app in 2018. I’ve used it religiously for the past 6 1/2 years and it is STILL amazing. Someone complained that it was too expensive at $15 (a few years ago). Are you kidding me?? For the serious musician that works at getting things right, this app is priceless. Given the amount of use, time saved, and difficult passages learned - I would in retrospect have gladly paid $50 for this. Regular updates keep it working smoothly. I also dislike that it won’t import protected songs from iTunes (which I HAVE paid for). Not the app designer’s issue - it’s Apple’s. But you can simply burn the songs you want to slow down onto a CD as a regular mp3 file, then import that version into your ITunes and import it into ASD. It’s an extra step, but again, if you’re serious, it works and is worth it. THANK YOU, app designer - this has been a godsend!