Algorithmix Sound Rescue vs PD Cleaner

Algorithmix Sound Rescue is standalone audio restoration software for reducing clicks and noise in recordings while preserving their original sound quality. It is designed for restoring vinyl, shellac, and cassette recordings for transfer to CD or DVD. Its DeScratcher and DeNoiser modules address transient noise, hiss, hum, rumble, and buzz. Other tools include DC-offset removal, normalization, bass and treble filters, Enhance, distortion softening, and drop-out masking. The software can select tracks automatically, filter and normalize them, split them, and generate a track list for a CD application. It accepts 44.1 kHz, 16-bit Red Book compatible WAV files. Listed requirements include 10 MB of free disk space, a 16-bit/44.1 kHz sound card, and a 1024×768 display with 16-bit color. Supported systems are Windows 2000 SP4, XP SP2, Vista, and Windows 7. A fully functional 14-day trial requires online activation. The full version is listed at $79.90, paid once; the pricing note also says From €2,092. The listed version is 3.04 build 267, last updated 17.11.2009.

PD Cleaner is a free Windows app for reducing clicks, crackle, hiss, and hum in old recordings, particularly public-domain recordings made before 1926. Drop in a file and it analyzes its era, noise, and clicks; a Clean dial lets you adjust the cleaning. Its voicings cover cylinders, acoustic 78s, and early electric recordings, alongside an uncoloured transfer option. A live before-and-after spectrum analyzer can show a curve, waterfall, or both, and users can solo noise being removed. The app works as a VST3 insert in a DAW or as a standalone program. Folder-based batch processing with one preset is limited to the standalone version. Built-in formats are WAV, FLAC, AIFF, Ogg, MP3, and Opus; a free optional add-on provides AAC and more. It supports 24-bit archival exports and says it does not overwrite the original file. The maker describes it as offline software. The Windows release is open source under AGPLv3, and its build may show an unknown publisher warning when first run.