# PWM not working for DDS2

**URL:** <https://forum.udo-audio.com/t/pwm-not-working-for-dds2/1643>\
**Category:** Super 6\
**Tags:** issue\
**Created:** [11 January 2023 08:42 UTC](https://forum.udo-audio.com/t/pwm-not-working-for-dds2/1643 "2023-01-11T08:42:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Parsoa](https://avatars.discourse-cdn.com/v4/letter/p/4491bb/32.png) [@Parsoa](https://forum.udo-audio.com/u/Parsoa)\
**Post date:** [11 January 2023 08:42 UTC](https://forum.udo-audio.com/t/pwm-not-working-for-dds2/1643/1 "2023-01-11T08:42:55Z")

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Not sure if I’m missing something but no matter what I do, I can’t hear any pulse-width modulation.

I’m on firmware 0.52

1. I init a patch (Shift + Manual)
2. Set mix to DDS2 only
3. Set DDS2 to square wave
4. Set all Env/LFO modulation sliders to zero
5. Set Super DDS1 to Off
6. Set LFO 1 frequency to some high value

Now I expect to clearly hear the change of pulse width by moving the PW or PWM faders. But I hear no difference in the timbre. This is how I naturally expect a synth to behave.

Am I missing something here about the Super 6 should behave?

Thanks!

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**Author:** ![Vanlesson](https://avatars.discourse-cdn.com/v4/letter/v/ba8739/32.png) [@Vanlesson](https://forum.udo-audio.com/u/Vanlesson)\
**Post date:** [11 January 2023 09:40 UTC](https://forum.udo-audio.com/t/pwm-not-working-for-dds2/1643/2 "2023-01-11T09:40:14Z")

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You need to set DDS2 not to square wave but to pulse wave (most right position)

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**Author:** ![HMan](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.udo-audio.com/hman/32/906_2.png) [@HMan](https://forum.udo-audio.com/u/HMan)\
**Post date:** [5 September 2024 21:41 UTC](https://forum.udo-audio.com/t/pwm-not-working-for-dds2/1643/3 "2024-09-05T21:41:49Z")

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Sometimes you just feel like an idiot. My son and I puzzled over this for too long today. Thanks.