# How to fine-tune audio-rate FM patches (ring mod)?

**URL:** <https://forum.udo-audio.com/t/how-to-fine-tune-audio-rate-fm-patches-ring-mod/3488>\
**Category:** Super Gemini\
**Created:** [14 July 2025 04:40 UTC](https://forum.udo-audio.com/t/how-to-fine-tune-audio-rate-fm-patches-ring-mod/3488 "2025-07-14T04:40:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![EscalatorMusic](https://avatars.discourse-cdn.com/v4/letter/e/c0e974/32.png) [@EscalatorMusic](https://forum.udo-audio.com/u/EscalatorMusic)\
**Post date:** [14 July 2025 04:40 UTC](https://forum.udo-audio.com/t/how-to-fine-tune-audio-rate-fm-patches-ring-mod/3488/1 "2025-07-14T04:40:48Z")

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I love the bell sounds I can get out of the FM, but it seems quite challenging to dial in the frequency ratios between DDS1 and DDS2. Without a really precise tuning, some regions of the keyboard just sound like exploding farts while the “Goldilocks Zone” of the keyboard sounds like beautiful bells.

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**Author:** ![EscalatorMusic](https://avatars.discourse-cdn.com/v4/letter/e/c0e974/32.png) [@EscalatorMusic](https://forum.udo-audio.com/u/EscalatorMusic)\
**Post date:** [14 July 2025 17:10 UTC](https://forum.udo-audio.com/t/how-to-fine-tune-audio-rate-fm-patches-ring-mod/3488/2 "2025-07-14T17:10:40Z")

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I’ve found the fine tune knob next to mod matrix. This is quite helpful, but I think it would be even nicer to have some way of scanning through exact simple frequency ratios.

It’s also a bit unfortunate that the fine tune knob has a limited range. Why not just let it keep going? I don’t care as much about the LED feedback.