Reader Florent Roux wrote in with a lot of praise for this new electric keyboard app from Gospel Musicians.
Professional quality electric piano libraries for live gigging and studio work on your iPad.
One of the first iOS music apps to feature real-time sample streaming, using Apple Lossless (CAF) format.
With the incredible success of our computer based versions of Neo-Soul Keys®, we felt it an obvious decision to bring our incredible electric piano libraries to the iOS. Despite the eagerness, we did not want to produce a sub-par app just for sake of making an electric piano library, so we worked directly with Apple’s engineers to bring to you, for the first time ever: SAMPLE STREAMING USING APPLE LOSSLESS CAF FORMAT. No other app that we know of offers real-time zone switching sample streaming with lossless compression. Many other sample library apps offer the samples to be loaded into memory, which obviously severely cripples the detail and amount of samples you are able to use. With sample streaming, we are able to use the same high quality sampling techniques, zone switching, and velocity layering, without sacrificing the quality similar to a desktop sample library. So what we did was load all of the electric piano effects samples in system memory, and dedicated the most important sustain samples to stream from the internal flash RAM. The results make for a high quality, low latency, and professional grade electric piano sound module that you can take with you and play live!
It is very interesting how they've positioned this. There is no playable on-screen keyboard, it is designed as a MIDI sound module for you to plug a MIDI keyboard into. Neo-Soul Keys is a free ad supported app, which comes with 3 excellent sounding free electric pianos. Presently the ads aren't showing. When they do start showing, and if that bothers you, you can unlock the individual keyboards for $10 each.
Here is a detailed tutorial and demo from the developer. Apparently "Urban (his word not mine) Gospel" is some grungy-dirty filth!