Definition from Wiktionary, the free dictionary
subtone (plural subtones)
- A secondary or lesser tone (in sound or colour).
2007 July 20, Ben Ratliff, “Sounds to Quiet a Crowd While Recalling Faded Times”, New York Times:
- 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.