V3.4.6
prepare for IDF V6.0
add user defined volume curve
new user settings:
- DMA_DESC_NUM, DMA_FRAME_NUM
- FREQ_LS_HZ = 500; IIR Filter, lowshelf
- FREQ_PEAK_HZ = 1800; IIR Filter, peakingEQ
- FREQ_HS_HZ = 6000; IIR Filter, highshelf
- PEAK_RELEASE = 1; VU_meter, Fall rate