Guides

Suno v6 songs get duller as they go. Here is what that is and how to even it out

Updated 2026-10-18

One complaint keeps coming back on r/SunoAI since v6 shipped: a song starts clean, and somewhere after the first minute or two it gets muddier or thinner. People describe the last chorus as sounding like the radio got switched from FM to AM. It is not every song, and it is not your speakers. When it happens, it shows up on a spectrum analyzer.

What it looks like

Take the first chorus and the last chorus of the same song and compare their spectra. They are the same part, so they should have roughly the same balance. On a song that drifts, the later one has less energy above about 4 kHz, sometimes less in the low end too, while the middle of the spectrum, where the vocal and the chords sit, barely moves. That is the signature of a gradual loss of bandwidth, not of a different arrangement.

Why one EQ curve cannot fix it

A mastering EQ is one curve for the whole file. If the first half is bright and the second half is dull, the curve that is right for the average is wrong for both halves: the opening gets too bright and the ending stays dull. You need a correction that changes over time, and only where the song actually changes.

How a section match works

• Split the song into sections from its own energy and tone, the same way you would mark verse and chorus by ear.
• Pick a reference: an early, loud section with the most top end. Usually the first chorus.
• Compare only the sections that are the same kind of part, about as loud and with the same balance in the middle. An intro or a breakdown sounds different because of what is playing, and correcting that would flatten the song.
• Correct later sections toward the reference in nine bands, gently: at most 3 dB in any band, ramped over a second at each boundary so you never hear a switch.
• Ignore one-off differences. A change has to persist across sections before anything moves.

What it cannot do

It cannot put back detail that was never generated. If the top end is cut by 7 dB, a 3 dB cap brings it partway, on purpose, because pushing a band that has little left in it raises noise faster than music. It also does nothing to a song that does not drift. Most songs are left exactly as they were.

How to check your song

Burnish runs the section match when the AI repair is on, and the report lists every section with its start and end time and the dB it changed in each band. If nothing drifted, the report says so and the table is all zeros. Run the free check first and hear the full master before you pay for anything.