iPad+Hardware+Web2.0+etc

 iPad Ensemble Mixers  You need a mixer to join them all together..
 * Once you have your iPad ensemble formed, you may have trouble hearing all the instruments..

Here are some suggestions for mixers to be used with ipad ensembles to tie into existing sound systems or ||  || []
 * ART SPLITMix4 Passive SplitterMixer 4 Stereo Input CH Passive Design Over 90dB of Attenuation ||

Or []
 * [[image:http://ecx.images-amazon.com/images/I/41u%2BZvspdCL._SL500_AA300_.jpg]] ||
 * external image 41u%2BZvspdCL._SL500_AA300_.jpg ||

Or for additional channels, something like this may work well

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You will of course need Cables and adapters to make all this work also! Amp Apple TV

Cheap computer speakers