The Mute modes decide how effect levels react when a block is bypassed. To better understand how the different mute modes work it's a good idea to imagine how individual effect blocks would react when bypassed by them.
Mix 0% means that the Mix level turns to 0% when a block is bypassed. This is normally used for effects meant to replace the dry signal, effects that you often use with their Mix value set to 100%. If you enable a bypassed delay or reverb effect with this Mute mode it will send out the effect tail of the dry sounds that entered it while bypassed. If you use the Mix 0% Mute mode with effects meant to be added to the dry signal and with a Mix value less than 100% you'll get an increased dry signal level when the effect is bypassed. For example, if Delay Mix is 20% you get 20% delay and 80% dry signal when the Delay is activated, but when bypassed the dry signal will jump to 100%.
FX Out mutes only the effect's Out level, not the dry sound passing through the block. For example, if you bypass a Reverb with Mix set to 25% it will turn off the reverb signal at once, but still let through the remaining 75% dry signal. This is good for effects that add something to the dry signal, like Reverb, Delay and sometimes Pitch Shift, since bypassing simply removes the added effect. If you use Fx Out with 100% Mix it will act like the Output Mute mode below, and you'll mute the whole block when bypassing it. Note that the signal entering the effect will not be muted, so if you enable a bypassed delay or reverb effect it will send out the effect tail of the sound that entered it while bypassed.
Output turns down the output level of both the effect and dry signal. The input of the effect will not be muted, so if you enable a bypassed delay or reverb effect it will send out the effect tail of the sound that entered it while bypassed.
FX In mutes the part of the block's input signal meant to be processed (as set by the Mix value) but will finish processing and sending out signal that already entered. Since it makes a reverb or delay tail will fade out after the effect block is bypassed, this is the Mute mode to use if you want effect spillover. Dry signal level remains unaffected. For example, if Mix is 60%, the 40% dry sound will remain as before when the effect block is bypassed; only the 60% effect will be muted at the block's input.
Input mutes all signal fed into a block, but allows delay and reverb tails to fade out like in FX In.
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