How do you use and programme effects and processors to shape a sound creatively and technically?
EQ, dynamics processing (compression, limiting, gating, expansion), time-based effects (reverb, delay) and modulation effects, plus the extensive programming of effect parameters in insert and send configurations.
An SQA Advanced Higher Music Technology answer on effects and signal processing, covering EQ types, compression and its controls, gating and expansion, reverb and delay, modulation effects, and how programming parameters in insert and send routing shapes a sound creatively and technically.
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What this skill is asking
The SQA wants you to use and programme effects and processors with control: shaping tone with EQ, controlling dynamics with compression, limiting, gating and expansion, creating space with reverb and delay, adding movement with modulation effects, and routing them correctly as inserts or sends. At Advanced Higher you are expected to programme parameters deliberately, not just load a preset, and to explain what each control does.
EQ
Equalisation is the most-used processor in any production. Subtractive EQ (cutting) cleans up problems and makes room in a busy mix, while additive EQ (boosting) adds character or air. The key controls are the frequency (where you act), the gain (how much boost or cut), and the Q or bandwidth (how wide the action is). A narrow, deep cut surgically removes a resonance or a hum; a broad, gentle shelf shapes overall tone. Knowing roughly what lives where, the low-end weight, the muddy low mids, the harsh upper mids and the airy top, lets you make targeted, justified moves.
Dynamics processing
Where EQ shapes frequency, dynamics shape loudness over time. A compressor narrows the dynamic range so a part stays present without jumping out, controlled by the threshold (where it starts), the ratio (how hard), the attack and release (how fast it reacts and recovers), and make-up gain (to restore level). Pushed to an extreme ratio with a fast response, it becomes a limiter that catches peaks. A gate does the opposite, silencing signal below a threshold to remove bleed between notes or hiss in the gaps, and a gentler expander reduces rather than cuts quiet signal. Sidechain compression, where one signal triggers the compression of another, is a common advanced technique (for example ducking a pad under a kick).
Time-based and modulation effects
Time-based effects place sounds in space and time. Reverb adds the dense reflections of a room or hall, with pre-delay separating the source from its tail so the sound stays clear; decay time sets how long the space rings. Delay produces distinct repeats, and syncing the delay time to the song's tempo (for example a dotted eighth) locks the echoes to the groove. Modulation effects work by mixing the signal with a copy whose pitch or phase is being swept by a low-frequency oscillator: chorus thickens and widens, flanger adds a sweeping jet-like comb, and phaser gives a softer swirling movement. Programming the rate, depth and mix of these is part of the creative palette the course rewards.
Insert and send routing
How an effect is connected matters as much as its settings. Processors that should act on the whole signal, such as EQ and compression, go on inserts. Effects you want to share and blend, such as reverb and delay, usually go on a send, so many tracks feed one effect (placing them in the same space) and you set the wet amount per track without altering the dry sound. This distinction, between processing in the channel and routing a copy elsewhere, is a core part of the signal-flow understanding examined at Advanced Higher.
Examples in context
A lead vocal chain often runs EQ and compression on inserts for tone and consistency, with reverb and a tempo-synced delay on sends for space. A drum bus uses compression to glue the kit and a gate on the snare to tighten it. A synth pad might use a slow chorus and a long reverb to sit wide and lush behind the track. In each case, the marks come from programming the parameters with intent and routing each effect in the way that serves the sound.
Try this
Q1. State what the ratio control on a compressor sets. [1 mark]
- Cue. How much the signal above the threshold is reduced (e.g. 4 to 1).
Q2. State what pre-delay does on a reverb. [1 mark]
- Cue. It delays the start of the reverb tail, separating the source from its ambience to keep it clear.
Q3. State which type of effect is usually placed on a send rather than an insert. [1 mark]
- Cue. Time-based effects such as reverb and delay, so they can be shared.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA AH style6 marksDescribe the function of each main control on a compressor (threshold, ratio, attack, release, make-up gain) and explain how you would set them to make a vocal sit steadily in a mix.Show worked answer →
The threshold sets the level above which the compressor acts; only signal louder than the threshold is reduced. The ratio sets how much it is reduced: a 4 to 1 ratio means that for every 4 dB the input rises above the threshold, the output rises by only 1 dB. The attack sets how quickly the compressor responds once the signal crosses the threshold, and the release sets how quickly it stops compressing once the signal drops back below it. Make-up gain raises the whole signal afterwards to compensate for the level lost to compression.
To make a vocal sit steadily, set the threshold so the compressor engages on the louder phrases, choose a moderate ratio (around 3 to 1 or 4 to 1) to even out the dynamics without squashing, use a medium attack so the consonants and transients still come through, and a release timed to the song so the compressor recovers between phrases without pumping. Then bring up make-up gain to restore a healthy level.
Markers reward a correct function for each named control and a coherent set of settings justified by the goal of an even, present vocal (engaging on loud parts, moderate ratio, transient-preserving attack, musical release, make-up gain to restore level).
SQA AH style4 marksExplain the difference between using a reverb as an insert effect and using it on a send (aux) bus, and say why a send is usually preferred.Show worked answer →
As an insert, the reverb is placed directly in a single channel and processes only that track, with a wet/dry mix set on the plug-in itself.
On a send, a copy of the track's signal is routed to a separate bus carrying the reverb, and the amount of reverb is set by how much each track sends. The dry signal stays on its own channel.
A send is usually preferred for two reasons. First, several tracks can share one reverb, which places them in the same believable space and uses fewer resources. Second, it gives independent control: the dry balance and the reverb amount are adjusted separately, and the reverb return can itself be EQ'd or compressed without touching the dry tracks.
Markers reward a correct contrast between insert (in the channel, that track only) and send (a routed copy to a shared bus), and a valid reason for preferring the send (shared space, efficiency, or independent wet/dry control).
Related dot points
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