Managing Analog Heat Input Gain with Dynamic Instruments?

Elektron Gear Analog Heat
1

Hi everyone,
I’m running into a gain staging issue with the Analog Heat FX when processing individual dynamic instruments (like the Moog Labyrinth or various poly/monophonic analog synths) rather than a full master mix.
These instruments often have massive dynamic swings—whether it’s transitioning from a subtle sine wave to a harsh wavefolder, opening/closing a filter, pushing the resonance, or going from a single note to a full chord.
The Analog Heat’s input section is notoriously sensitive; to get the best signal-to-noise ratio and drive, you need to push the input level right up to the maximum threshold without clipping the converters. This creates a Catch-22:
If I set the input gain for the quieter parts: The dynamic peaks (opened filter, resonance spikes, wavefolding) brutally clip the digital input, causing harsh digital distortion.
If I set the input gain for the loudest peaks: The lower-level signals become way too quiet, failing to hit the analog drive circuit hard enough to get any meaningful saturation or tone shaping.
How do you effectively manage dynamic range and gain staging on the Analog Heat when dealing with single instruments that have huge volume fluctuations?

Any advice or recommendations would be greatly appreciated!

2 Likes
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Use a compressor before the AH to tame dynamic range. Same as it ever was.

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^This. And, you can use the AH +FX’s compressor: just put it before the drive in the chain.

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I don’t disagree with the advice above but I’d also set levels as consistently as possible. It is a chore but absolutely worthwhile.

How are you using the ahfx? Do you have it after a mixer, or are you connecting devices directly?

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Assuming no major underlying problems and a reasonably clean connection between these modern pieces of gear, your noise floor should be very low. Relative to even the softest parts, it’s just not the issue it was in the 60s-70s. It’s good to be aware of this in a ‘best practices’ kinda way as heavy processing later can raise the noise floor. It’s OK to set the input for the loud parts and even leave some extra.

You have a lot of options for driving the heat circuit more consistently.

-Easiest is the built-in compressor. The signal flow in the manual shows the compressor and all the other FX blocks before the heat circuit. Heavy compression involves heavy makeup gain which will raise the noise floor of the softer parts. A lighter touch makes sense here.
-One of the coolest features of AH is the envelope followers. Using the filters, they can follow lower frequencies only and respond the same whether the synth’s filter is wide open or closed. Assign one or both to the heat drive and you have a ton of creative control over how heat saturates.
-If this is for a recording, you can leverage a synth’s main out + headphone out and send one to AH to process softer signals and the other straight to the recorder. You can process that second signal separately on AH, use another distortion box, etc. The two signals would become out of phase and you’d have to re-align them when combining them.
-You could use MIDI to split your performance to another synth just to control heat. It could be very basic and control the heat circuit predictably or be very weird.

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Compressor before makes sense, although you might want to preserve the dynamics?
An experiment to do would be to input the pre-compressed signal (sidechain) as a CV input into Heat and use that to revert the compressed dynamics by modulating preset volume, or heat level or something. Might be possible to do with the internal envelope follower and compressor if the follower gets pre-compressed signal.