Calder

Making seventeen sample packs means delivering thousands of files, every one of them named, formatted, and looped exactly to spec. I built Calder because checking all of that by hand was the worst part of the job.

What it does

Filename editing. Calder breaks filenames into parts based on separators, so you can select, move, swap, merge, and batch-rename by position — plus find-and-replace, generate mode, and metadata tools.

Audio standards. Check sample rate, bit depth, loudness, and format compliance against your specs.

Loop QC. Verify BPM tags and sample-length accuracy for loops.

Profiles. Save your naming rules, audio specs, and QC settings as reusable, shareable presets.

Under the hood

A native desktop app built in Python with PySide6/Qt. The audio-analysis engine runs BPM detection, chromagram-based key analysis, and metadata extraction on Librosa, FFmpeg, and custom DSP — so the loop and format checks are measured, not guessed.

Get it

Calder lives at calder.tools.

Found something confusing, or something broken? I genuinely want to hear it — send feedback or write me at benbromley@gmail.com.