How to Route a Soundcraft Si Impact with Waves SuperRack Performer

What This Soundcraft and Waves Guide Covers

The purpose of this setup is to use one dedicated Waves H-Reverb rack for multiple microphones. Each vocal can have its own reverb-send level, while Channels 37 and 38 control the overall stereo reverb level in the main mix.

• Connecting the Soundcraft Si Impact to SuperRack Performer
• Understanding the MADI-USB channel-number offset
• Using Mix 11 as a shared Waves effects send
• Creating a dedicated H-Reverb rack
• Returning the reverb to Channels 37 and 38
• Adding reverb to each vocal channel
• Preventing a reverb feedback loop
• Saving the Si Impact Show and SuperRack session
• Troubleshooting missing signal or missing reverb

Equipment Used in This Setup

• Soundcraft Si Impact digital mixing console
• Soundcraft Mini Stagebox 32
• Soundcraft MADI-USB card
• Windows laptop
• Waves SuperRack Performer
• Waves H-Reverb
• Waves vocal-processing plugins

Your exact channel numbers may be different, but the same routing method can be adapted to another Si Impact Show.

The Complete Waves Reverb Signal Path

Step 1: Save the Working System Before Making Changes

Before changing any routing, save a new copy of both systems.

• Save the current Soundcraft Si Impact Show under a new name.
• Save the current SuperRack Performer session under a new name.
• Confirm that the Soundcraft USB/MADI driver is selected in SuperRack.
• Keep the PA at a safe level while testing.
• Keep the reverb-return faders down until the signal path is confirmed.

Suggested Si Impact Show name: SOS 1 – Shared Reverb Working

Suggested SuperRack session name: SOS 1 – Reverb Working.sprk

Step 2: Understand the MADI-USB Channel Offset

In this working system, Si Impact MADI USB card numbers above 32 appear inside SuperRack as Soundcraft channels numbered 32 lower.

Step 3: Confirm the Normal Waves Vocal Routing

Do not build the shared reverb until the normal Waves vocal channels are working correctly.

1. Select dry vocal Channel 16 on the Si Impact.
2. Open Input 16 Setup.
3. Confirm that the Input Patch is the correct stage-rack input.
4. The working lead vocal uses SR A-16.
5. Confirm that DirectOut Patch is MADI USB Card 34.
6. In SuperRack, confirm the lead-vocal rack input is Soundcraft 2.
7. Talk into the microphone and confirm the SuperRack input meter moves.
8. Confirm the processed vocal returns to its normal Waves return channel and is heard in LR.

Step 4: Create Mix 11 as the Waves Reverb Send

1. Press the physical Mix 11 button on the Si Impact.
2. Confirm that the Mix 11 button lights orange.
3. Select the Mix 11 master.
4. Open Mix 11 Setup.
5. Set Mix Width to Mono.
6. Under Patching, set Output Patch 01 Left to Multi Digital In/Out Card → MADI USB Card 54.
7. Leave Output Patch 01 Right unused because Mix 11 is mono.
8. Raise the Mix 11 master fader to approximately 0 dB for testing.
9. While Mix 11 is selected, raise the send fader for one test vocal, normally Channel 16.
10. Talk into the microphone and confirm that the Mix 11 master meter moves.

Step 5: Build the Dedicated SuperRack H-Reverb Rack

1. Choose one unused SuperRack rack.
2. The working session uses the rack labeled CH20.
3. Set the rack input to Soundcraft 22.
4. Insert only Waves H-Reverb in this rack.
5. Do not place CLA-76, C6, PSE, or other vocal-processing plugins in the shared reverb rack.
6. Open H-Reverb.
7. Set the Mix/Wet control to 100% wet.
8. Talk into the test microphone.
9. Confirm both the SuperRack input and output meters move.
10. Assign the rack output to the stereo return route used by Si Impact Channels 37 and 38.

H-Reverb Starting Settings

• Wet/Dry: 100% wet
• Decay: approximately 1.6 to 2.2 seconds
• Pre-delay: approximately 50 to 80 milliseconds

Fine-tune these settings during soundcheck. A smaller or more reflective room will normally need less decay and less overall reverb.

Step 6: Set Up the Stereo Reverb Return

The final Waves reverb return is located on Layer B of the Si Impact.

• Bring Channels 37 and 38 up together.
• Start both return faders near -10 dB.
• Keep both faders at matching levels.
• Make sure both channels are assigned to LR.
• While Mix 11 is selected, keep Channels 37 and 38 muted, off, or fully down in that mix.
• Do not send Channels 37 and 38 back into Mix 11.

Step 7: Send Every Vocal to the Shared Reverb

Press Mix 11. The channel faders now control how much of each dry vocal is sent into Waves H-Reverb.

1. Press Mix 11.
2. Raise the Mix 11 send on dry vocal Channels 15 through 19 as needed.
3. Test one microphone at a time.
4. Confirm the Mix 11 master meter moves for each vocal.
5. Listen to the reverb tail after stopping speech.
6. Adjust each singer with that singer’s Mix 11 send.
7. Use Channels 37 and 38 together as the master reverb level.

Step 8: Normal Show-Day Startup Checklist

• Power on the Si Impact and stagebox first.
• Wait for the console and stagebox to finish starting.
• Start the Waves laptop.
• Connect the USB/MADI cable.
• Turn off Wi-Fi and Bluetooth.
• Close unnecessary programs.
• Open Waves SuperRack Performer.
• Load SOS 1 – Reverb Working.sprk.
• Load the matching Si Impact Show.
• Confirm the sample rate is 48 kHz.
• Confirm the audio buffer is 128 samples.
• Test the dry vocal monitor path.
• Test the processed Waves FOH return.
• Press Mix 11 and confirm the vocal sends are present.
• Confirm the reverb rack input and output meters move.
• Confirm Channels 37 and 38 are ON in LR.
• Confirm Channels 37 and 38 are not feeding Mix 11.
• Bring the PA up slowly and adjust the final reverb level.

Step 9: Quick Troubleshooting Guide

Step 10: Save and Back Up the Working System

• In SuperRack, choose Save As.
• Save inside the default SuperRack Sessions folder.
• Use a clear name such as SOS 1 – Reverb Working.sprk.
• On the Si Impact, save the Show under a matching name.
• Make another copy of the SuperRack file on a USB drive or OneDrive.
• Restart both systems and confirm the routing loads correctly.