Lab · eight-generation field comparison
Did “roomy and distant” move the vocal farther back?
Eight Suno v5.5 generations kept the title, lyrics, musical brief, and exclusions stable. Four requested a roomy, distant lead; four requested a close, mostly dry lead. The directions did not transfer with equal consistency.
Only A4 clearly delivered the intended distant, reverberant vocal. B1, B2, and B4 clearly delivered close, mostly dry vocals; B3 stayed dry but sounded somewhat farther back. This is a repeated field comparison, not a seed-matched controlled experiment.
Listen to the closest musical match
Start close, then move farther back
B1 and A4 were the closest pair in singer character, melody, tempo, and arrangement. Start with B1, then switch to A4. The two links begin at corresponding listening moments rather than the same clock time.
Creator observation: little obvious reverb; lead vocal sounds close. Start at 1:13.
Creator observation: more obvious reverb; lead vocal sounds farther away. Start at 1:17.
What stayed stable
The generation plan used the shared title The Last Word; the public records were then labeled A1–A4 and B1–B4 for review. All eight used the same lyrics, the same v5.5 model, and the same musical core: an intimate indie-pop ballad at 78 BPM in a minor key, restrained verses, a gently lifted chorus, warm female alto lead, sparse electric piano, soft bass, brushed drums, and a faint analog pad. Both conditions also asked for relatively dry, restrained instruments so the vocal-space request remained the intended variable.
All eight generation records
Retain the misses as part of the result
| Record | Requested condition | Creator listening observation | Classification |
|---|---|---|---|
| A1 | Roomy / distant | No obvious reverb; vocal sounds close. | Direction not clearly followed |
| A2 | Roomy / distant | No obvious reverb; vocal sounds close. | Direction not clearly followed |
| A3 | Roomy / distant | No obvious reverb; vocal sounds close. | Direction not clearly followed |
| A4 · 1:17 | Roomy / distant | Reverb is more obvious; vocal sounds farther away. | Clear condition match |
| B1 · 1:13 | Close / mostly dry | No obvious reverb; vocal sounds close. | Clear condition match |
| B2 | Close / mostly dry | No obvious reverb; vocal sounds close. | Clear condition match |
| B3 | Close / mostly dry | No obvious reverb; vocal sounds somewhat farther away. | Partial condition match |
| B4 | Close / mostly dry | No obvious reverb; vocal sounds close. | Clear condition match |
What the result supports
The main pair supports a concrete listening observation: B1 sounds closer and drier, while A4 sounds farther back with more obvious ambience. The full set supports a second observation about consistency in this run: the close/dry request transferred more often than the roomy/distant request.
Evidence boundary: these generations were not produced from a shared fixed seed, and musical details can vary between renders even when the inputs are held stable. The records show what happened in this eight-generation run. They do not prove that either phrase caused every difference or that another session will produce the same match rate.