Does a plugin cause latency when bypassed?

I have a plugin which adds a little bit of latency - just wondering if it adds that latency when bypassed?

To be honest, I can’t notice the additional latency when it is active, but was more out of interest!

The short answer is yes—but how much latency depends on the plugin itself. With many, it’s virtually non-existent but when the plugin itself has some built-in latency for processing—say, for pitch modification—then its more noticeable.

You can try a simple experiment like this to hear the degree of latency.

A plugin is not supposed to induce latency to other plugins if they are not on the same audio « chain ».
Moreover, there are plugins not inducing any latency when active, so I suppose that if you bypass a plugin, It cannot generate more latency than an active plugin which doesn’t induce latency.
My conclusion would be that a bypassed plugin doesn’t induce latency.

I’ve learnt that you have to be careful when using plugins in parallel, like in @edm11 ’s screenshot.

If the Harmony plugin has latency, GP will compensate and ensure the combined signal when mixed is in sync.

BUT, if you bypass the Harmony plugin, GP will still be applying the compensation and you will get phasing issues. So in this situation, if you don’t want the Harmony plugin active, you should also mute that channel in the mixer, as well as bypassing the plugin. Because really, why would you want the dry signal from that channel/branch anyway?

I came across this when using multiple delay and reverb plugins in parallel, then combining them in a mixer block.

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That’s correct. In this way, the Bypass feature is not actually a bypass. It’s a Through with plugin effect turned on or off.

Did you bypass with the GP bypass or did you bypass within the plguin itself?

GP bypass.