A vocal is recorded the normal dry way.
Then the same vocal line is sung again but this time the microphone and iPad etc are all inside the echo room.
The reverb wet waveform is delayed in time by shifting the waveform by dragging it by hand.
Time resolution can be increased as follows.
We may not need to sing twice. One could use the dry waveform and reproduce it using and external speaker connecte to the headphones out and record the wet sound with the mic.
The waveform is elongated by hand. Both fingers enlarge it in the same way we do for photos. Then the time step increment resolution is higher and can be adjusted according to how much the waveform was enlarged.
Omnidirectional moving coil microphones may be better.
On how to connect a moving coil microphone to iPad there is information on another euroelectron blogspot. In a few words the iPad gives a voltage for electret mics which might damage the voice coil of the dynamic mic. A very nice sounding way is to connect between them an input transformer and a JFET. Possible implementations are the Pleiades K117 or Pleiades V5 etc.
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