You are the Critic agent for an audio reconstruction loop. Your goal is to help produce this composition so it sounds exactly like the target source. The music Producer has made a pass at it, and you are an expert musician, sound designer, and mix engineer giving advice on what production steps to take next. You will write this guidance to a file,

You are the Critic agent for an audio reconstruction loop.

Your goal is to help produce this composition so it sounds exactly like the target source. The music Producer has made a pass at it, and you are an expert musician, sound designer, and mix engineer giving advice on what production steps to take next. You will write this guidance to a file, and we will pass that file to the Producer.

You can listen to the audio files themselves. We have also done an in-depth audio analysis of the differences between the rendered audio and the target audio. Reason over both the audio and the analysis.

Read and use these inputs:

• Composition: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/arrangement.json
• Current patch session: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/patch_session_current.json
• Target audio: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/source_clip.wav
• Current rendered audio: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/current_render_step_initial.wav
• Loss report: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/loss_report_step_initial.json

Definitions:

• Composition is the fixed musical performance: tracks, roles, note events, velocities, timing, active ranges, tempo, and meter.
• Patch session is the current sound design, effects, and mix attempt: synth settings, envelopes, filters, modulation, effects, sends, gain, pan, width, returns, and master settings.
• Target audio is the reference clip we are trying to reconstruct.
• Current rendered audio is what the current patch session produces from the fixed composition.
• Loss report contains measured inaccuracies between the target audio and current rendered audio.

Task: Write a concise markdown briefing to: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/critic_brief_step_01.md

Your briefing should tell the Producer what to change next in the patch session so the rendered audio gets closer to the target source.

Do this:

1. Listen to the target audio.
2. Listen to the current rendered audio.
3. Compare what you hear against the loss report.
4. Read the composition so you understand which tracks are active and what role each track plays.
5. Read the current patch session so you know what synth, effects, and mix choices are already being used.
6. Identify the most important inaccuracies blocking a better reconstruction.
7. Recommend concrete production changes for the next Producer pass.

Use all available evidence:

• global mix score
• per-track active-window scores
• isolation proxy scores
• weakest tracks
• envelope/ADSR diagnostics
• brightness/filter diagnostics
• modulation diagnostics
• stereo/space diagnostics
• saturation/noise diagnostics
• arrangement preservation diagnostics
• sustain_shape diagnostics, especially largest 50ms RMS errors and pumping/reversal counts
• audible differences between target audio and current rendered audio

Be specific. For each recommendation, name the track id, the problem, and the exact production move.

Possible production changes include:

Oscillator/source:

• Change a track synth toward sine, triangle, square, pulse, saw, supersaw, fifth-saw, organ, electric piano, string pad, bass, noise, or drum-like source.
• Add, remove, or rebalance oscillator layers.
• Detune oscillators more or less.
• Add octave doubling, sub oscillator, fifth, or unison.
• Change pulse width or waveform blend.
• Make the source more pure, buzzy, hollow, nasal, glassy, warm, thin, thick, metallic, or noisy.

Pitch and tuning behavior:

• Add or reduce pitch drift.
• Add or reduce pitch envelope.
• Add or reduce portamento/glide.
• Change vibrato rate or depth.
• Tighten or loosen pitch stability.

Envelope and articulation:

• Increase or decrease attack.
• Increase or decrease decay.
• Increase or decrease sustain.
• Increase or decrease release.
• Make notes more plucky, more legato, more gated, more sustained, softer, sharper, punchier, or smoother.
• Shorten long tails that smear the rhythm.
• Lengthen releases if the target has more sustain or ambience.

Filter and brightness:

• Raise or lower filter cutoff.
• Increase or decrease resonance.
• Use low-pass, high-pass, band-pass, notch, or shelving behavior.
• Add or reduce filter envelope amount.
• Make the sound brighter, darker, thinner, warmer, more muffled, more open, more nasal, or more resonant.
• Change filter attack, decay, sustain, or release if the brightness evolves incorrectly.

Amplitude and dynamics:

• Raise or lower track gain.
• Add or reduce velocity sensitivity.
• Add or reduce compression.
• Add or reduce transient punch.
• Make a track more forward, more tucked back, more even, more dynamic, more aggressive, or softer.
• Change gain automation if a part should grow, fade, pulse, or duck.

Modulation and motion:

• Add or reduce tremolo.
• Add or reduce vibrato.
• Add or reduce filter LFO.
• Add or reduce amplitude LFO.
• Change modulation rate.
• Change modulation depth.
• Sync modulation to tempo or make it freer.
• Add slow evolving motion for pads.
• Remove motion if the target is steadier.

Effects and space:

• Add or reduce reverb.
• Change reverb size, decay, pre-delay, damping, or wet level.
• Add or reduce delay.
• Change delay time, feedback, filtering, stereo spread, or wet level.
• Add or reduce chorus, ensemble, phaser, flanger, or widening.
• Make a track drier, wetter, closer, farther, wider, narrower, more washed out, or more direct.
• Shorten reverb tails if the mix is blurry.
• Increase space if the target has more late energy or width.

Saturation, distortion, and noise:

• Add or reduce saturation.
• Add or reduce drive, clipping, bitcrush, tape color, harmonic density, or grit.
• Add or reduce noise floor, breath, hiss, or texture.
• Make a sound cleaner, dirtier, warmer, harsher, softer, or more compressed.

Stereo and placement:

• Move a track left, right, or center.
• Increase or decrease stereo width.
• Collapse low-frequency tracks toward mono.
• Widen pads, keys, or effects if the target is broader.
• Narrow tracks that are too diffuse.
• Adjust pan or width if the stereo image does not match.

Mix balance:

• Raise or lower specific tracks.
• Rebalance bass, chords, lead, strings, drums, and effects.
• Push the main hook forward.
• Tuck supporting parts behind the lead.
• Reduce masking between bass and keys.
• Adjust master gain if the render is globally too loud or quiet.
• Adjust EQ balance if the whole render is too bright, dull, boomy, thin, harsh, or muddy.

Drums and percussion, if present:

• Change drum level.
• Change kick/snare/hat balance.
• Make drums punchier, softer, brighter, darker, tighter, roomier, drier, or more saturated.
• Add or reduce transient emphasis.
• Add or reduce drum room/reverb.
• Adjust cymbal/hat brightness and decay.

Prioritization:

• Start with the changes most likely to improve the full rendered audio.
• Prefer high-impact track and mix changes over tiny parameter tweaks.
• If arrangement preservation is perfect and the target is sustained, rank envelope automation before timbre when whole-clip RMS is close but 50ms/local windows are extreme.
• When pitch_chroma is high but f0_contour is low on a dense sustained pad, describe it as a tone/source or octave-support uncertainty, not as evidence to change notes.
• Provide one primary objective for the next Producer pass and list which edit families should be avoided in that pass.
• If the loss report and your listening disagree, explain the disagreement and choose the more musically plausible action.
• If the full mix does not provide enough evidence to isolate a track, say so and recommend a conservative change.

Write markdown only. Keep it practical and direct. The Producer should be able to act from the briefing without guessing.

File-driven orchestration requirement:

• Write the markdown briefing at: text2fx_gemini/ui_runs/20260511_140156_srfix_patch/critic_brief_step_01.md
• The orchestrator will pass that markdown file to the Producer after this run.

I’ll inspect the arrangement, patch session, and loss diagnostics first, then use local audio analysis/listening aids to compare the source and render before writing the critic brief.

The setup is just two sustained chord layers over a 5-second clip, so the biggest questions are envelope shape, timbre/source, width, and whether the target has pulsing/noisy motion that the current static patch lacks. I’m pulling the lower loss-report sections now because those usually identify the concrete track priorities.

The diagnostics point to a render that is much too quiet after the initial moment, too mono, too static/slowly pumping, and spectrally too mid/presence-heavy versus the source’s bass/low-mid sustain. I’m doing one quick direct audio measurement pass to confirm the heard/metric shape before writing the handoff.

I have enough evidence now. I’m going to write the brief as a production task list: first fix sustain/gain automation and low-mid body, then fix stereo and modulation, with arrangement changes explicitly off-limits.

The briefing file is written. The repo has a pre-existing modified source file I did not touch, so I’ll commit only the new critic brief and leave that existing change alone.

The run output directory is ignored by default, so I’ll force-add just the requested markdown file to satisfy the repo’s commit/push rule without staging the existing midi_locked_patch.py modification.

The commit step is blocked by filesystem permissions on .git/index.lock, not by a merge conflict. I’ll verify the repository metadata permissions once, then I’ll leave the file in place if Git remains unavailable.

Wrote the briefing to critic_brief_step_01.md.

I also attempted to follow the repo instruction to commit/push, but Git metadata is not writable in this sandbox: creating .git/index.lock fails with Operation not permitted. The pre-existing modified file text2fx_gemini/midi_locked_patch.py was not touched.