Hello again Kaangdev,
I understand your requirement now, to have a rough-and-ready app within a few days. I can provide this for you no problem, provided I have a detailed description of your requirements. I can complete the following in 5 days:
- record .wav to the SD card
- playback the .wav file
- modify playback speed/pitch
- delay (echo)
- reverb
Is there anything else you will need?