AU and VST3: what is the difference?
AU (Audio Units) is Apple’s plugin format and is commonly used by DAWs on macOS. VST3 is Steinberg’s cross-platform format and is widely supported on macOS and Windows. The format is the way your DAW loads the plugin; it is not a measure of sound quality by itself.
Check your DAW, operating system and plugin installation options before buying. A plugin can be excellent and still be the wrong choice if your host cannot load its format. SUS4 plugins are supplied as AU and VST3 where listed, with macOS, Windows and Linux support shown on the product catalogue.
Start with the problem, not the plugin name
Use an EQ when a frequency is masking something or the balance needs shaping. Use compression when the level or envelope needs controlling. Use a gate or expander when unwanted sound needs managing between phrases. Use reverb or delay when you need depth, space or a deliberate repeat.
These are decisions about the signal, not shopping categories. If bypassing the plugin does not reveal a useful difference, remove it or reset it. A small template of dependable tools is easier to mix with than an unfamiliar collection of hundreds.
- EQ: make room or shape tone.
- Compression: control dynamics and envelope.
- Gate or expander: manage unwanted signal between sounds.
- Reverb and delay: create depth, distance and movement.
- Creative effects: change the character when clean processing is not enough.
Learn one compressor before buying five
A compressor becomes useful when you can predict what attack, release, ratio and threshold will do to the sound. Start with a source where the problem is obvious: an uneven vocal, a bass part that disappears, or a drum whose impact needs shaping. Match the output level before judging whether the processing is better.
The SUS4 bundle includes focused tools such as Strike-76, Lume-2A and Aurum-670, each with a different character and workflow. Compare them by the decision they help you make, not by a promise that one setting will mix every track.
Use a plugin as part of a repeatable mix process
A practical home-studio chain often starts with gain and balance, then corrective EQ or dynamics, then tone and space. Reference the mix at a sensible level, take breaks, and check the result on more than one playback system. No plugin can compensate for a monitoring problem you have not noticed.
The SUS4 plugin range adds a Sus switch to every instrument and effect: a second behaviour intended for creative decisions, not just a preset colour. Start with the conventional mode, make the mix work, and use the switch when the arrangement needs a different movement or texture.
A sensible first plugin setup
If you are starting from zero, choose one compressor, one EQ, one reverb and one delay that your DAW can load reliably. Spend a week using them on different sources before adding more. Keep notes about what you changed and why; that turns plugin knowledge into mixing knowledge.
When you know which category you need, the SUS4 catalogue lets you compare the available tools and formats in one place. The bundle is an option for people who want the whole range, but it is not a requirement for learning to mix well.
Common questions
Should I use AU or VST3 on a Mac?
Use the format your DAW supports consistently. AU is Apple’s native format and VST3 is also supported by many Mac DAWs; neither format is automatically better sounding. Check the host and plugin compatibility before installing.
What are the first plugins a home studio needs?
A dependable EQ, compressor, reverb and delay are a practical starting set. Most DAWs already include these, so buy or install another plugin when it gives you a workflow or sound you can explain—not simply because the category is missing.
Do more plugins make a mix sound better?
Not by themselves. A plugin should solve an audible problem or create an intentional musical effect. More options can help later, but learning a small set deeply usually produces faster, more repeatable decisions.