* Cleanup and fix issue with DMA transfers on T4 (#13)
* Fix issue with max delay on external memory in AudioEffectAnalogDelay
* Cleanup of tremolo and analog delay effects
* Improved potentiometer getValue() function
* Updated and tested examples with T4.0
* Added intepolated delay capability to AudioDelay class
* renamed testing verision of AudioEffectAnalogDelay.cpp
* Updates to the internal functions in BAPhyscontrols for better switch/pot support
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