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

[CuriousOne]

Sorry for late reply
All I need is for it to play loud and clear.
I've added extra RC filtering circuit, as shown in manual, also I have external transistor amplifying the sound, but output is still not sounding good.

By the way, claude excells in generating PBP code from the uploaded midi files - the code below plays the some cartoon music, converted from the midi file, with 2 voice polyphony using FREQOUT statement:

Main:
    FREQOUT SPEAKER, 125, 523
    PAUSE 125
    FREQOUT SPEAKER, 125, 261, 523
    PAUSE 125
    FREQOUT SPEAKER, 125, 523
    PAUSE 125
    FREQOUT SPEAKER, 125, 261, 587
    PAUSE 125
    FREQOUT SPEAKER, 125, 659
    PAUSE 125
    FREQOUT SPEAKER, 125, 261, 659
    PAUSE 125
    FREQOUT SPEAKER, 125, 523
    PAUSE 125
    FREQOUT SPEAKER, 125, 261, 659
    PAUSE 125
    FREQOUT SPEAKER, 250, 783
    FREQOUT SPEAKER, 125, 329, 783
    PAUSE 125
    FREQOUT SPEAKER, 250, 659
    FREQOUT SPEAKER, 125, 329, 659
    PAUSE 125
    FREQOUT SPEAKER, 250, 783
    FREQOUT SPEAKER, 125, 329, 783
    FREQOUT SPEAKER, 250, 783
    PAUSE 125
    FREQOUT SPEAKER, 125, 329
    PAUSE 125
    FREQOUT SPEAKER, 125, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 659
    PAUSE 125
    FREQOUT SPEAKER, 125, 587
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 587
    PAUSE 125
    FREQOUT SPEAKER, 125, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 880
    FREQOUT SPEAKER, 125, 880
    FREQOUT SPEAKER, 250, 783
    FREQOUT SPEAKER, 125, 195, 783
    PAUSE 125
    FREQOUT SPEAKER, 250, 698
    FREQOUT SPEAKER, 125, 195, 698
    PAUSE 125
    FREQOUT SPEAKER, 250, 783
    FREQOUT SPEAKER, 125, 195, 783
    FREQOUT SPEAKER, 250, 783
    PAUSE 125
    FREQOUT SPEAKER, 125, 195
    PAUSE 125
    FREQOUT SPEAKER, 250, 659
    FREQOUT SPEAKER, 125, 261, 659
    FREQOUT SPEAKER, 125, 659
    PAUSE 250
    FREQOUT SPEAKER, 125, 261, 698
    FREQOUT SPEAKER, 125, 698
    FREQOUT SPEAKER, 250, 783
    FREQOUT SPEAKER, 125, 261, 783
    PAUSE 125
    FREQOUT SPEAKER, 250, 659
    FREQOUT SPEAKER, 125, 261, 659
    PAUSE 125
    FREQOUT SPEAKER, 125, 880
    PAUSE 125
    FREQOUT SPEAKER, 125, 220, 880
    PAUSE 125
    FREQOUT SPEAKER, 125, 880
    PAUSE 125
    FREQOUT SPEAKER, 125, 220, 987
    PAUSE 125
    FREQOUT SPEAKER, 250, 1046
    FREQOUT SPEAKER, 125, 220
    PAUSE 125
    FREQOUT SPEAKER, 250, 880
    FREQOUT SPEAKER, 125, 220, 880
    PAUSE 125
    FREQOUT SPEAKER, 125, 1174
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 1174
    PAUSE 125
    FREQOUT SPEAKER, 250, 1174
    FREQOUT SPEAKER, 125, 293, 1046
    PAUSE 125
    FREQOUT SPEAKER, 250, 987
    FREQOUT SPEAKER, 125, 195, 783
    FREQOUT SPEAKER, 125, 783
    FREQOUT SPEAKER, 250, 987
    FREQOUT SPEAKER, 125, 195, 1174
    FREQOUT SPEAKER, 125, 1174
    FREQOUT SPEAKER, 250, 1046
    FREQOUT SPEAKER, 125, 261, 1046
    FREQOUT SPEAKER, 125, 1046
    FREQOUT SPEAKER, 250, 987
    FREQOUT SPEAKER, 125, 261, 987
    FREQOUT SPEAKER, 125, 987
    FREQOUT SPEAKER, 250, 880
    FREQOUT SPEAKER, 125, 220, 880
    FREQOUT SPEAKER, 375, 880
    FREQOUT SPEAKER, 125, 220
    PAUSE 125
    FREQOUT SPEAKER, 250, 698
    FREQOUT SPEAKER, 125, 293, 698
    FREQOUT SPEAKER, 250, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 783
    FREQOUT SPEAKER, 125, 783
    FREQOUT SPEAKER, 250, 880
    FREQOUT SPEAKER, 125, 293
    PAUSE 125
    FREQOUT SPEAKER, 250, 1046
    FREQOUT SPEAKER, 125, 293, 1046
    PAUSE 125
    FREQOUT SPEAKER, 250, 987
    FREQOUT SPEAKER, 125, 195, 987
    PAUSE 125
    FREQOUT SPEAKER, 250, 880
    FREQOUT SPEAKER, 125, 195, 880
    PAUSE 125
    FREQOUT SPEAKER, 250, 987
    FREQOUT SPEAKER, 125, 195, 987
    PAUSE 125
    FREQOUT SPEAKER, 250, 1174
    FREQOUT SPEAKER, 125, 195, 1174
    PAUSE 125
    FREQOUT SPEAKER, 250, 1318
    FREQOUT SPEAKER, 125, 261, 1174
    PAUSE 125
    FREQOUT SPEAKER, 250, 1046
    FREQOUT SPEAKER, 125, 261, 1046
    FREQOUT SPEAKER, 125, 1046
    PAUSE 250
    FREQOUT SPEAKER, 125, 261, 1046
    PAUSE 125
    FREQOUT SPEAKER, 125, 1046
    PAUSE 125
    FREQOUT SPEAKER, 125, 261, 987
    PAUSE 125
    FREQOUT SPEAKER, 250, 1046
    FREQOUT SPEAKER, 125, 220, 987
    FREQOUT SPEAKER, 125, 987
    FREQOUT SPEAKER, 250, 880
    FREQOUT SPEAKER, 125, 220, 880
    FREQOUT SPEAKER, 250, 880
    PAUSE 125
    FREQOUT SPEAKER, 125, 220, 523
    FREQOUT SPEAKER, 125, 523
    FREQOUT SPEAKER, 250, 587
    FREQOUT SPEAKER, 125, 220, 659
    FREQOUT SPEAKER, 125, 659
    FREQOUT SPEAKER, 250, 698
    FREQOUT SPEAKER, 125, 293, 698
    FREQOUT SPEAKER, 125, 698
    FREQOUT SPEAKER, 250, 698
    FREQOUT SPEAKER, 125, 293, 698
    FREQOUT SPEAKER, 250, 698
    PAUSE 125
    FREQOUT SPEAKER, 125, 293, 659
    FREQOUT SPEAKER, 125, 659
    FREQOUT SPEAKER, 250, 698
    FREQOUT SPEAKER, 125, 293, 659
    FREQOUT SPEAKER, 125, 659
    FREQOUT SPEAKER, 125, 587
    PAUSE 125
    FREQOUT SPEAKER, 250, 195
    FREQOUT SPEAKER, 125, 293
    PAUSE 125
    FREQOUT SPEAKER, 125, 195, 293
    FREQOUT SPEAKER, 250, 195
    PAUSE 125
    FREQOUT SPEAKER, 125, 195, 293
    FREQOUT SPEAKER, 125, 195
    FREQOUT SPEAKER, 125, 195, 293
    PAUSE 125
    FREQOUT SPEAKER, 250, 195
    PAUSE 500


    GOTO Main  ' Loop forever