Synth and Studiotrack belong to a group of very useful music apps for the iPad.

The iPad has been around only for a short time, but already developers have been busy at work coming up with an array of apps and the results of their work is quite impressive. That is evident in the musical field where a few apps have emerged as very useful for music makers and lovers. They range from virtual synthesizer, multitrack recording program, to a virtual analog musical instrument etc. Here are five of them:
1.The Synth polyphonic synthesizer from Retronyms. Modeled after the MIDI keyboard controller, it comes with over 40 built-in instruments, five control knobs, a modulation wheel, and the ability to choose between five octaves using the octave buttons. The app also have a "sample record" button which allows you to sample sounds using the iPad's built-in mic.
The Synth app is available at the iTunes store for $1.
2.According to pcworld.com, StudioTrack from Sonoma Wire Works is a multitrack recording program exclusively designed for the iPad. It has key features like multi-track recording, a metronome, an effect rack for each channel.
3. Modeled after Korg'Electribe series of analog synthesizers, iELECTRIBE is a full-on virtual analog musical instrument synthesizer that offers a lot of effects, sound banks and a a step sequencer. It sells for $ 20 at the iTunes store.
4.Amateur music makers will find the Groovemaker very useful thanks to its large library of loops that allow users to layer them therefore creating music on the go. It comes in two versions: a free one and one selling for $10 at the iTunes store.
5.For people wanting longing to spin vinyls, Mixr turntable app still in the development, offers that chance. According to pcworld, using the Mixr feels the same as spining real vinyls with the possibility to go back and forth and to cut and mix between tracks.
Still in development, the Mixr app is not priced yet but people interested can fill out a form at Mixr.com and get updated on the development's progress.