# Does Tracktion Engine Support Custom Send ——Issue with Sidechain Plugins in Waveform Free due to Missing Send Routing UI”Routing (Aux/Sidechain Routing)?

**URL:** https://forum.juce.com/t/does-tracktion-engine-support-custom-send-issue-with-sidechain-plugins-in-waveform-free-due-to-missing-send-routing-ui-routing-aux-sidechain-routing/66360
**Category:** Tracktion Engine
**Created:** [June 13, 2025, 4:50am UTC](https://forum.juce.com/t/does-tracktion-engine-support-custom-send-issue-with-sidechain-plugins-in-waveform-free-due-to-missing-send-routing-ui-routing-aux-sidechain-routing/66360 "2025-06-13T04:50:23Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Nana1](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/nana1/32/20826_2.png) [@Nana1](https://forum.juce.com/u/Nana1)
#### Post date: [June 13, 2025, 4:50am UTC](https://forum.juce.com/t/does-tracktion-engine-support-custom-send-issue-with-sidechain-plugins-in-waveform-free-due-to-missing-send-routing-ui-routing-aux-sidechain-routing/66360/1 "2025-06-13T04:50:23Z")

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Hi everyone，

When using plugins like Mvocoder that require a track send (such as for sidechaining) in Waveform Free, I found that the side chain can only be set up within the plugin’s own UI, but Waveform Free itself doesn’t provide any UI or options for configuring a send track. As a result, the side chain setup in the plugin is actually not functional. Is this because Waveform Free does not give users access to the send routing UI or controls?

Additionally, does Tracktion Engine (TE) support custom send routing, including dual-channel or multi-channel routing scenarios? Is this implemented through Aux Send and Aux Return mechanisms? If so, how can such routing be set up and managed within TE?

Any code examples or workflow suggestions would be highly appreciated!

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### Author: ![dave96](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/dave96/32/8487_2.png) [@dave96](https://forum.juce.com/u/dave96)
#### Post date: [June 17, 2025, 2:44pm UTC](https://forum.juce.com/t/does-tracktion-engine-support-custom-send-issue-with-sidechain-plugins-in-waveform-free-due-to-missing-send-routing-ui-routing-aux-sidechain-routing/66360/2 "2025-06-17T14:44:05Z")

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Side chain routing is done via the plugin window in Waveform, the button in the top-left next to the window close button lets you configure sidechain inputs.

Iin TE code, take a look at `Plugin::setSidechainSourceByName` and then `Plugin::makeConnection` to determine the channel routing.