If the Tracks MIDI is going out a different Port to a VSTi, it shouldn't get to the T4

Using ROG's suggested setup;
On a Track you want to send to PianoTeq -
Right-click the Track and select Port, then pick one above 17. These are reserved for VSTi's; Ports 17 - 32.

Then assign a synth to that Port using the top most of the four FX Slots.
The top one will be for VSTi, and the next three for VST effects if the Track is a MIDI track.

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.. I do not work here, but the benefits are still awesome