From Roland:

Born of the most famous and influential drum machines ever made,
the TR-8S combines the best of its Roland heritage with modern production techniques and professional sound design. The result? A forward-thinking, performance-tuned instrument unlike any other.

Build your dream kit from the most iconic drum sounds of all time,
plus the finest selection of samples from our vast library—or import your own custom samples. Tap, tune, and tweak with hands-on controls and production tools that make your patterns move and groove. And why keep this kind of percussive power confined to the studio?

The TR-8S comes loaded with the largest, most authentic collection of TR drum machines available. The powerful new processor gives our next-generation ACB models a whole new level of detail and nuance, giving you that classic Roland boom, snap, and sizzle. And now you can incorporate preset and custom samples, creating unique hybrid and layered kits, and enhance them with specialized effects that inject professional sound design into the TR formula.

User Drum Kit: 128
User Patterns: 128
Step Sequencer: 

• 11 instrument parts and 1 exclusive part for trigger out
• 16 steps per 1 variation
• 8 (A – H) variations per 1 pattern
• 2 Fill-in patterns per 1 pattern

INST tone: 

• (Tone can be assigned to each 11 instrument parts freely.)
• BASS DRUM: 11 ACB tones
• SNARE DRUM: 8 ACB tones
• TOM: 15 ACB tones
• RIM SHOT: 3 ACB tones
• HAND CLAP: 5 ACB tones
• HI HAT: 8 ACB tones
• CYMBAL: 8 ACB tones
• PERCUSSION: 23 ACB tones
• PRESET SAMPLE: 300 tones or greater
• USER SAMPLE (imported form SD CARD for playback): Available format: WAV, AIFF
• Total time for all samples: Approximately 600 sec (at 44.1 kHz, mono)

Effects:

• INST FX: THRU, HPF, LPF, LPF/HPF, H BOOST, L BOOST, L/H BOOST, ISOLATOR, TRANSIENT, COMPRESSOR, DRIVE, COMP+DRV, CRUSHER
• REVERB: AMBI, ROOM, HALL1, HALL2, PLATE, MOD
• DELAY: DLY, PAN, TAPE ECHO
• MASTER FX: HPF, LPF, LPF/HPF, H BOOST, L BOOST, L/H BOOST, ISOLATOR, TRANSIENT, TRANSIENT2, COMPRESSOR, DRIVE, OVERDRIVE, DISTORTION, FUZZ, CRUSHER, PHASER, FLANGER, SBF, NOISE
• Other: SIDE CHAIN (for EXT IN), SCATTER (as one of AUTO FILL IN function)

Display:

• 16 characters, 2 line (backlit LCD)
• 7 segments, 4 characters (LED)

External Storage: SD Card (SDHC supported) for backup/restore function and import sample data
Connectors:

• PHONES jack: Stereo 1/4-inch phone type
• MIX OUT (L/MONO, R) jacks: 1/4-inch TRS phone type
• ASSIGNABLE OUT/TRIGGER OUT (1 – 6) jacks: 1/4-inch phone type
• EXT IN (L/MONO, R) jacks: 1/4-inch phone type
• TRIGGER OUT jack: Miniature phone type
• MIDI (IN, OUT) connectors
• USB port: USB type B (Audio, MIDI)
• DC IN jack

Power Supply: AC adaptor
Current Draw: 2,000 mA
Accessories:

• AC adaptor
• Owner's manual
• Leaflet “USING THE UNIT SAFELY”

Width: 16-1/8 inches
Depth: 10-3/8 inches
Height: 2-5/16 inches
Weight: 4 lbs. 11 oz.