# How to Set Up Mix‑Minus on Rodecaster Pro II, Zoom PodTrak P4 & Focusrite Scarlett > Learn step‑by‑step how to configure mix‑minus on Rodecaster Pro II, Zoom PodTrak P4 and Focusrite Scarlett for flawless, echo‑free podcast recordings. - Date: 2026-10-21 - Author: Expert Guide Team - Category: Configure Mix‑Minus - Canonical: https://acousticpodcasting.com/blog/how-to-set-up-mixminus-on-rodecaster-pro-ii-zoom-podtrak-p4-focusrite-scarlett/ ## Introduction In this guide the reader will learn how to configure a mix‑minus signal path using three popular podcasting tools: the [RØDECaster Pro II](https://amazon.com/dp/B0B17V8NGX?tag=wpem020126-20), the [Zoom PodTrak P4](https://amazon.com/dp/B08F8HL7T7?tag=wpem020126-20) and a Focusrite Scarlett interface. Mix‑minus eliminates the acoustic feedback that occurs when a remote guest hears their own voice through the call‑in line. By following the steps below the podcaster will achieve a clean, echo‑free recording environment suitable for both live streaming and post‑production. The value of a reliable mix‑minus setup lies in its ability to preserve conversational flow while protecting the host’s headphones from unwanted latency. The techniques described here are applicable to any digital [audio](#) workstation (DAW) but are optimized for the hardware listed above. The guide assumes a basic familiarity with XLR cabling, USB connections and the concept of phantom power. Each section recommends specific products, explains why they are suited for the task, and provides pricing and rating information drawn from verified Amazon data. The reader may choose to follow the workflow with alternative gear, but the recommended tools represent a cost‑effective, high‑quality solution. By the end of the article the podcaster will possess a fully functional mix‑minus chain, a set of best‑practice tips and a troubleshooting checklist to address common issues. ## What You'll Need - [RØDECaster Pro II](https://amazon.com/dp/B0B17V8NGX?tag=wpem020126-20) – all‑in‑one console with four XLR inputs, eight SMART pads and dual USB‑C interfaces (price $578.00, rating 4.4/5). - [Zoom PodTrak P4](https://amazon.com/dp/B08F8HL7T7?tag=wpem020126-20) – portable recorder with four XLR inputs, mix‑minus phone input and four headphone outputs (price $149.99, rating 4.7/5). - [Focusrite Scarlett Solo](https://amazon.com/dp/B07QR6Z1JB?tag=wpem020126-20) – single‑channel USB‑C audio interface with high‑performance mic preamp (price $119.99, rating 4.6/5). - Two balanced XLR cables (minimum 10 ft each). - One TRRS‑to‑3.5 mm adapter for phone‑line integration. - Headphones with at least 32 Ω impedance for accurate monitoring. - Micro‑SD card (32 GB minimum) for on‑board recording on the PodTrak P4. ## Step 1: Connect the Core Devices Begin by arranging the hardware on a stable surface. Connect the primary microphone to the first XLR input on the [RØDECaster Pro II](https://amazon.com/dp/B0B17V8NGX?tag=wpem020126-20). Engage phantom power if the microphone requires it; the console provides 48 V phantom on all four preamps, ensuring consistent gain for condenser mics. Next, link the console’s USB‑C output to the computer running the preferred DAW (e.g., Audacity, Adobe Audition or Reaper). The dual‑USB architecture of the Pro II permits simultaneous streaming and multitrack recording without driver conflicts. Connect the [Zoom PodTrak P4](https://amazon.com/dp/B08F8HL7T7?tag=wpem020126-20) to the same computer via its USB‑Audio Interface mode. This creates a secondary recording path that can capture each input on an individual track, a feature useful for post‑production editing. Finally, attach the [Focusrite Scarlett Solo](https://amazon.com/dp/B07QR6Z1JB?tag=wpem020126-20) to the computer using the supplied USB‑C cable. The Solo will serve as a dedicated line‑in for the remote guest’s phone audio, allowing the mix‑minus algorithm to operate independently of the main console’s monitoring chain. ## Step 2: Configure Mix‑Minus on the RØDECaster Pro II Access the Pro II touchscreen menu and navigate to **Inputs & Outputs**. Select the channel that will receive the phone call (typically Channel 4). Activate the *Mix‑Minus* option; this routes all [audio](#) except the phone input back to the headphones, preventing the guest from hearing their own voice. Assign the phone line to the TRRS jack on the console using the provided adapter. The built‑in APHEX processing presets (e.g., “Broadcast Voice”) can be applied with a single tap, delivering a polished sound without manual EQ. Set the headphone output levels for each host’s monitor. The Pro II offers independent volume control per output, a critical feature when multiple hosts share a single console. The rating of 4.4/5 indicates reliable performance for this use case. Save the configuration as a custom preset named “Mix‑Minus Podcast” for rapid recall in future sessions. ## Step 3: Route Phone Audio Through the Zoom PodTrak P4 On the PodTrak P4, select the **Phone Input** mode. Connect the same TRRS adapter used for the Pro II to the recorder’s dedicated phone jack. Enable the automatic mix‑minus function; the device will subtract the phone channel from the main mix that is sent to the headphones. Because the PodTrak P4 provides four separate headphone outputs, each host can monitor a personalized mix. Adjust the individual volume knobs to achieve a comfortable listening level without causing clipping. The recorder’s sound pads can be programmed with intro music or sponsor messages. Trigger these pads during the call to maintain a professional flow without interrupting the remote guest. Insert a micro‑SD card into the recorder’s full‑size slot. The P4 supports up to 3.5 hours of recording on two AA batteries, but for extended sessions it is advisable to power the unit via a USB power bank to avoid battery depletion. ## Step 4: Use the Focusrite Scarlett Solo as a Dedicated Line‑In Plug the TRRS‑to‑3.5 mm adapter’s 3.5 mm end into the Solo’s instrument input. The Solo’s high‑headroom preamp will capture the phone signal cleanly, and the Gain Halo metering provides visual feedback to set an optimal level. Within the DAW, create a separate audio track labeled “Remote Guest”. Assign the Solo’s input to this track and enable monitoring through the DAW’s mix‑minus plugin (many DAWs include a built‑in mix‑minus utility). This ensures that the remote participant hears only the hosts, not their own voice. The Solo’s balanced outputs can feed studio monitors for reference listening. Because the device draws power directly from the USB connection, no external power adapter is required, simplifying cable management. With a rating of 4.6/5 and a price of $119.99, the Solo offers a cost‑effective alternative to larger multi‑channel interfaces while still delivering 24‑bit/192 kHz conversion quality. ## Step 5: Verify Signal Flow and Test for Echo Before recording a full episode, perform a loopback test. Initiate a phone call to the TRRS jack, speak into the primary microphone, and listen through the headphones. The host should hear the microphone and any music pads, but not the remote voice. Observe the level meters on the Pro II, PodTrak P4 and Solo simultaneously. All three devices should display consistent levels, indicating that the mix‑minus routing is functioning correctly across the entire chain. If echo is detected, reduce the send level from the phone input on the Pro II and re‑test. Small adjustments often resolve residual latency caused by USB buffering. Record a short 30‑second segment on the PodTrak P4’s SD card and export the multitrack files to the computer. Review each track in the DAW to confirm that the remote guest’s audio is isolated from the host’s monitor mix. ## Tips & Pro Tips - Use high‑quality, shielded XLR cables to minimise hum and interference, especially when routing signals between the Pro II and the Solo. - Enable the “Low‑Cut” filter on any channel that captures [vocal](#) content to reduce plosive noise. - When recording outdoors, power the PodTrak P4 with a reliable USB power bank to extend battery life beyond the 3.5‑hour AA limit. - Leverage the Pro II’s eight SMART pads for on‑the‑fly sound effects; this reduces the need for post‑production editing. - For multi‑host podcasts, assign each host a separate headphone output on the PodTrak P4 to maintain individualized monitoring levels. - Keep the firmware of all devices up to date; the RØDECaster Pro II frequently receives enhancements to its mix‑minus algorithm. ## Troubleshooting **Problem:** Remote guest hears their own voice (feedback). **Solution:** Verify that mix‑minus is enabled on both the RØDECaster Pro II and the Zoom PodTrak P4. Ensure that the phone line is not routed to the main mix output on the Solo. **Problem:** No audio appears on the “Remote Guest” track in the DAW. **Solution:** Confirm that the TRRS adapter is securely connected to the Solo’s instrument input and that the DAW input channel is armed for recording. Check the Solo’s gain setting; it should be set to a level where the Gain Halo indicator shows a moderate signal. **Problem:** High latency when monitoring through the Pro II. **Solution:** Reduce the buffer size in the DAW’s audio preferences. If latency persists, consider using the Pro II’s direct USB monitoring mode, which bypasses the computer’s processing path. ## Conclusion This guide has demonstrated a systematic method for establishing a reliable mix‑minus configuration using the [RØDECaster Pro II](https://amazon.com/dp/B0B17V8NGX?tag=wpem020126-20), [Zoom PodTrak P4](https://amazon.com/dp/B08F8HL7T7?tag=wpem020126-20) and [Focusrite Scarlett Solo](https://amazon.com/dp/B07QR6Z1JB?tag=wpem020126-20). By following the numbered steps, the podcaster can eliminate echo, maintain clean headphone mixes and capture multitrack recordings for flexible post‑production. The recommended tools combine portability, high‑quality preamps and intuitive interfaces, making them suitable for both studio‑based and field recordings. With the troubleshooting checklist and pro tips, the reader is equipped to resolve common issues and refine the workflow for future episodes. ## Products Mentioned in This Guide ![RØDECaster Pro II](https://imagedelivery.net/9HFzmUrZT1VKBNvEeC85mQ/9ae5c2c7-d5f1-4763-e2ad-fdef1d0e4900/public) ### [RØDECaster Pro II](https://amazon.com/dp/B0B17V8NGX?tag=wpem020126-20) Price: $578.00 | Rating: 4.4/5 (1,328 reviews) ![Zoom PodTrak P4](https://imagedelivery.net/9HFzmUrZT1VKBNvEeC85mQ/fe271ec7-07d3-4c86-e4c8-5090a22abf00/public) ### [Zoom PodTrak P4](https://amazon.com/dp/B08F8HL7T7?tag=wpem020126-20) Price: $149.99 | Rating: 4.7/5 (1,852 reviews) ![Focusrite Scarlett Solo](https://imagedelivery.net/9HFzmUrZT1VKBNvEeC85mQ/2fb534bc-1531-4370-15b2-42dcd1687500/public) ### [Focusrite Scarlett Solo](https://amazon.com/dp/B07QR6Z1JB?tag=wpem020126-20) Price: $119.99 | Rating: 4.6/5 (29,587 reviews) ## Frequently Asked Questions ### What is a mix‑minus signal and why is it important for podcasting? A mix‑minus sends the full program audio to a remote guest except for their own voice, preventing echo and feedback during calls. ### How do I enable mix‑minus on the RØDECaster Pro II? Route the call‑in channel to a separate mix bus, then assign that bus to the headphones output while excluding the guest’s own mic from the mix. ### Can the Zoom PodTrak P4 create a mix‑minus setup, and what are the key steps? Yes; use the ‘Call‑In’ routing to send the main mix to the guest’s headphones and mute the guest’s mic from that specific output. ### What settings are required on a Focusrite Scarlett interface to achieve mix‑minus? Create a separate output mix in the Focusrite Control software that includes all channels except the remote’s input, then route that mix to the headphone output. ### What common issues cause mix‑minus to fail and how can I troubleshoot them? Typical problems include routing the guest’s mic into their own mix or incorrect USB channel assignments; verify routing tables and test each path individually.