FreqSense

{See video at top of page}

A spectrum analyzer that lets you load a reference track and compare it with your mix.

Features:

• Reference track, synced. Load any audio file and it follows your DAW timeline automatically. Or switch to free mode and seek by clicking the waveform. Loudness is matched automatically for fair A/B comparisons.
• Dual spectrum display. Draw a second spectrum behind your mix and instantly see where they differ — the reference track, the Side channel, a sidechain bus, or another FreqSense instance running on any track.
• Band Solo. Frequency bands sit above the display. Hold to solo, click to latch, or drag the borders to customize the layout.
• Hold. Freeze the spectrum as a snapshot and compare individual sounds — whether it's a snare, kick, vocal, or anything else.
• Peak notes. Automatically labels prominent spectral peaks with their musical notes in real time.
• Mid/Side solo. Listen to the Mid or Side channel independently.
• Hover readout. Inspect the exact frequency, level, and musical note under the cursor.
• Display controls. Adjust slope, response speed, and FFT size (2048–16384).
• REAPER embedded UI. Show the spectrum right on the TCP or MCP.
• Clean, lightweight interface. Customizable themes and visual adjustments.

The trial has no time limit and no feature restrictions — just a small badge in the UI. You can use it as long as you want, and if you'd like to support development or remove the badge, you can grab a key.