Effect chain order: what goes where and why

A DSP chain is not a bag of effects, it is a pipeline. Your mic feeds the first node, the first node feeds the second, and so on down the line. Nothing except the first effect ever hears your raw mic. So reordering two effects is not rearranging furniture: it changes what each effect measures and reacts to. Same effects, same settings, different order, different sound. In the worst case, a broken one.

The canonical order for a voice chain

For a microphone the order is settled practice, and every step has a one-line reason: clean up first, shape later, transform last.

• 1. High-pass / EQ. Remove rumble and junk frequencies before anything downstream gets a chance to measure them.
• 2. Noise suppression. Strip the steady hiss so every later effect sees a quieter floor.
• 3. Gate. Seal the gaps between words. After suppression the floor is low, so the gate threshold can sit low too.
• 4. Compressor. Even out the level of a signal that is already clean, so it only works on your voice.
• 5. Creative effects. Reverb, character, anything decorative. Polish goes on the finished surface, not under it.
• 6. Persona last. A voice changer should receive the final, clean, level signal. Feeding it noise or uneven levels means transforming the noise along with the voice.

If you remember one phrase, make it this: measure clean, then shape. Every effect that reacts to loudness (the gate, the compressor) makes better decisions when the junk was removed before it, not after.

What breaks when you swap a pair

The canonical order is easiest to trust once you know exactly what goes wrong when you deviate. Each common swap has a specific, repeatable failure.

• Compressor before gate. A compressor with makeup gain raises everything, and everything includes your noise floor. Lift the floor enough and it climbs above the gate threshold you set against the old, quieter floor. The gate opens and stays open, and it looks like the gate is broken when it is doing exactly what you told it to. The advanced tier below does this failure as arithmetic.
• Gate before suppression. The gate now judges the raw floor instead of the suppressed one. Suppression can drop a floor from around -50 dB to around -70 dB; gate first and your threshold has to sit up near the noisy -50, where it starts shaving the quiet starts and ends of words. Gate after suppression and the threshold sits low with room to spare. The two are partners with a fixed order: suppression strips the floor, the gate seals the gaps.
• EQ or high-pass last. Rumble is energy even when you cannot hear it as tone, and detectors measure energy. Put the high-pass at the end and every loudness-reactive effect upstream spent the whole chain reacting to garbage: the gate opens on desk thumps, the compressor clamps down on bus rumble that was never going to reach your stream anyway. The high-pass costs nothing at the front and fixes nothing at the back.

Notice that none of these failures come from bad settings. They come from a correct setting being evaluated against a signal it was never tuned for. That is the whole lesson of chain order: an effect's settings are promises about its input, and the order decides whether the input keeps them.

The broken gate, as arithmetic

Here is the compressor-before-gate failure with real numbers. Your room noise sits at -50 dB and you set the gate threshold at -45 dB, giving the floor 5 dB of clearance below the line. Speech crosses the threshold, the room never does, and the gate works.

Now insert a compressor before the gate and dial in +8 dB of makeup gain to restore loudness after the peaks come down. The floor at -50 dB sits far below the compressor's own threshold, so compression itself leaves it untouched; makeup gain, however, is a flat lift applied to every sample that passes through.

The gate compares that floor against the threshold you set when the floor was 5 dB lower:

Same gate, same threshold, same compressor, and every setting is individually defensible. The only bug is the order. Swap the two nodes so the gate runs first and the floor the gate measures is -50 dB again, comfortably under the line; the compressor then applies its makeup to a signal whose gaps are already sealed, so there is nothing in the gaps for it to lift.

The same clearance arithmetic shows why suppression belongs before the gate. Define the gate's working margin as the distance from the floor up to the threshold:

Five decibels of margin is a gate that works until you buy a louder fan. Twenty-five is a gate you stop thinking about.

Fixing order should be one drag

In patchd the chain is an effects rack on every channel, and the order on screen is the signal flow, top to bottom. Every node here (EQ, suppression, gate, compressor) is free on every channel, and the rack is drag-to-reorder: if your compressor ended up ahead of your gate, the fix is dragging a card one slot, not rewiring anything. Set the canonical order once, watch the meters agree with the math above, and the chain stays fixed while you tune. patchd is in development now. Join the waitlist and we will tell you the moment it is ready to install.