subtone
nounEtymology From sub- + tone.
1
A secondary or lesser tone (in sound or colour).
- It had a slight rasp, soft subtones in the low notes and even control through the registers; he scattered stylized shakes of vibrato all through his playing.2007 July 20, Ben Ratliff, “Sounds to Quiet a Crowd While Recalling Faded Times”, in New York Times: