DTFM Dial Tones(onlinetonegenerator.com)
onlinetonegenerator.com
DTFM Dial Tones
https://onlinetonegenerator.com/dtmf.html
2 comments
Dual-tone multi-frequency so DTMF
DTFM Dial Tone generator. Apperantly each tone is just a sum of two sine waves. Cool!