Roland S550: A Comprehensive and Versatile 12-bit Sampler

The Roland S-550, released in 1987, is a rackmount digital sampler that serves as an expanded version of the Roland S50. It can function both as an expander to the S50 and as a standalone sampler.

Key Features:

• 16 voices of polyphony (double the industry standard at that time)
• Sample rates: 30kHz and 15kHz
• 28.8 seconds of sample memory at 30kHz (1.266 MB)
• 1.5 MB of sample memory (double that of the S50)
• Time Variant Filters (TVF), similar to those in the Roland D50
• Sampling rate: 12-bit at 30 or 15 kHz
• 16-bit D/A converters for output
• MIDI synchronization capability
• 8 individual polyphonic outputs + 1 mix output
• 32 Tone locations per bank, 16 patches per block
• Multitimbral capabilities (up to 8 patches simultaneously)

User Interface:

• CRT display required for operation (not included)
• Compatible with RC-100 Remote Controller and MU-1 mouse (MSX standard)
• Cannot use DT-100 Digital Tablet (unlike the S-50)
• Compatible with original Roland Pedal Switch DP-2 and BOSS FS-5U

Storage and Compatibility:

• Uses 3.5" Micro Floppy Disk MF2DD
• Can be upgraded with Gotek SFRM72-FU-DL USB FDD emulator
• Factory sample disks: L-501 to L-509
• Extensive third-party sample libraries available
• SCSI support with the original HD5-IF card or a modern substitute

Notable Improvements over S50:

• Increased sample memory
• Addition of real-time filters (TVF)
• 8 individual outputs
• Enhanced voice allocation modes
• Ability to play up to 8 samples simultaneously

Limitations:

• Disk-based operating system requires disk swapping for some functions
• Some voice allocation restrictions for monophonic playback

Historical Significance:

• Popular choice for both studio and live use in the late 80s and early 90s
• Still highly regarded by enthusiasts of 80s-90s music technology

Overall Assessment:

The Roland S-550 represented a significant advancement in sampling technology of its time. Its increased memory, new features like the TVF and a support for many external equipment, and versatile MIDI capabilities made it a powerful tool for music production. While it requires external hardware like a CRT display for operation, its flexibility and sound quality have ensured its lasting appeal among vintage gear enthusiasts.