H90 with Helix floor routing question

The advantage of Dual mode is that the H90 behaves like two independent effects processors; we’ll call them Path 1 (I/O 1&2) and Path 2 (I/O 3&4). You would be able to position each path anywhere in your signal flow. For example, use Path 1 to into the Helix and Path 2 somewhere in the FX loop. At any given time, both Eventide algorithms can be on Path1 or both on Path 2. You can also have one on each path. Be mindful, that dual mode, however, does not allow the use of inserts.

In stereo, Insert Mode’s signal path flows from inputs 1&2 to Output 1&2. I/O 3&4 can be used for two mono insert points or one stereo insert. If you’re using the H90 in mono, you should only use I/O 1.

When the H90 is in Dual mode, there are two signal paths; you can see them when you enter the Routing menu. The top signal flow is I/O 1&2 in stereo or I/O 1 in mono. The bottom signal flow is I/O 3&4 in stereo or I/O 3 in mono.

Perhaps it may help you to watch our Part 3 tutorial where we discuss Dual Routing mode. We go over the four-cable method, connecting to audio interfaces, using the H90 as a mixer, and incorporating the H90 in wet/dry rigs: https://etide.io/H90T3

If you want to take advantage of both paths on the same signal flow, yes.

Each Path in Dual mode can be mono or stereo depending on which outputs are connected. For example, if you connect a cable to Outs 1&2, Path 1 will function in stereo. If you only connect Out 1, it will function in mono. The same with Path 2 using 3&4.