Those are the only two tones.

只有这两个音调。

youdao

Sometimes you hear two tones.

有时会听到2种音调。

youdao

Did we forget the circuitry, sure a volume control as usual, and two tones, but the middle tone works on the neck and middle pickup, with the back tone working on the bridge pickup.

哦，我们还忘了说电路控制部分，对，还是跟原厂的一样，一个音量控制旋钮，和两个音色控制旋钮，不过我们做了些细微的调整，中间档位控制的是琴颈与中拾音器的音色，后档位控制的是琴桥拾音器的音色。

youdao

If two tones, one high and one low, were played about 40 milliseconds apart, the best readers had no trouble telling which tone came first.

ECONOMIST: The cat sat on the tam | The

These showed that unless the two tones were sufficiently separated in time, only one electrical signal, rather than two, was generated by the brains of the affected mice in response.

ECONOMIST: Reading minds | The

He puzzled out (and only later learned that 19th-century German engineer Heinrich Helmholtz had gotten there before him) that when two tones are played simultaneously and loudly enough, they interact to spawn two new tones.

FORBES: Magazine Article