Why SOUND statement produces loud and clear sound, but FREQOUT - does not?

[CuriousOne]

Hello
AI has no answer.

even at 64mhz, FREQUOUT provides very low volume, distorted audio, while SOUND, even on 4Mhz 628A chip, produces loud and clear sound.
This is not chip or hardware issue - tested on numerous 12F-16F-18F devices. This is PBP issue as it seems. Can we fix it somehow?

[Ioannis]

Because FREQOUT is using PWM with the ability to output two tones at the same time, so filtering is required to produce a, relatively clean, sinewave-looking tone.

On the otjher hand, SOUND produces only one, rectagular TTL signal, with no filtering. So yes the amplitude is very different.

But you did not showed how you use the output signal, what is your circuit.

Ioannis