also in espeakedit (not ng) the resampling quality seemed to be so-so (maybe not sox's fault, maybe command-line-settings) but resampling from a low-quality source-wav file isn't the same as starting from one of higher quality

default currently is 22050 HZ 16-bits maybe increase to 32kHz+ and 32-bit-float compile option to do down-sample

and if using sox use best-quality sinc option, max precision

[espeak-ng:master] New Issue Created by cmrdt:
#179 multi-channel voice output for DSPs, mixing or debugging

add command option to split voice into multiple channels?

• voice-tone
• voice-tone-roughness
• consonants voiced
• consonants unvoiced
• breath

(time/pitch stretching, noise removal, compression)

[espeak-ng:master] New Comment on Issue #178 upgrade internal audio quality (sample rate and bit-depth)
By cmrdt:

also if audio file same quality as device native-sampling rate, it would not have to resample again