At System Original Test Tapes
English ZX Spectrum system tutor for Italians. 

Anglotutor Test 1
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Anglotutor Test 8

These files are present on 2 tapes and recorded in 4 tracks mode. 
Original Tapes collected by Salvatore Lasorella and Restored by Jurij Gianluca Ricotti at JGRStudios Rome italy. 

PROCESS:
All tapes was processed and sampled with Studer Tape player and restored with DSPQuattro on a Mac. 
WAV Files was restored, eq, and clipped with specific plugins, then resampled with an original ZX Spectrum 48k with 007 Spy software to recreate every bit perfectly and re sampled with DSPQuattro to obtain a new WAV without tape artefacts. The new wave files was converted with Fuse in .sna .szx .z80.

Reference
www.jgrstudios.com
https://www.facebook.com/groups/1913318498962773