Roland TR-707 Rhythm Composer - Exclusive Soundgas HKA Modified Edition- SN 601036

For Sale: Professionally Modified & Serviced Roland TR-707 serial number 601036 - Premium Vintage Drum Machine with 8-Bank Sound Expansion

Transform your rhythm production with this expertly modified Roland TR-707 Rhythm Composer, featuring the exclusive Soundgas HKA mod expansion. This legendary 1980s drum machine has been enhanced with cutting-edge EPROM sound banks while maintaining complete reversibility and original functionality.

Key Features & Specifications

Enhanced Sound Capabilities
8 Complete Sound Banks - Massive sonic expansion from original single bank
Exclusive Soundgas Custom Banks - Four banks feature our signature sound selection
Non-Invasive Modification - Completely reversible, maintains original TR-707 operation
Professional Installation - Modified by one of our expert synth techs
Fresh Service - Fully serviced and calibrated for optimal performance & reliability

Sound Bank Collection

Classic Roland & Exclusive Soundgas Custom Banks:

TR-707 - Original vintage Roland sounds
TR-727 - Latin percussion companion sounds
TR-808 - Iconic hip-hop and electronic drums
TR-909 - Essential house and techno rhythms
Soundgas Roland CR/TR Collection - Rare CR-78 &; TR-66 sounds
Soundgas Korg Favourites - KR-55 & Mini Pops 7 vintage gems
Soundgas Elka/Maestro Fusion - Drummer One meets Rhythm King hybrid
Soundgas Toy Box - Unique Mattel &Casio character sounds

Technical Details

Bank Switching: Hold any of first 8 step keys during power-on
Memory Retention: Selected bank remembered between sessions
Cymbal Sounds: Last two sounds (crash/ride or quijada/chime) remain across all banks
Sample Quality: Short, punchy samples optimized for EPROM storage
External Appearance: No visible modifications - maintains original aesthetic

Operation & Compatibility

Power Requirements: 12V Centre Negative power supply (not included)

Soundbank Sources: All samples sourced from authentic vintage machines

Warranty Coverage: Protected by standard Soundgas warranty

Why Choose This Modified TR-707?

Vintage Authenticity Meets Modern Versatility

The only vintage drum machine you need? We love these units - with a great combination of vintage sound and essential features for maximum flexibility (midi, individual outputs and volume controls for each voice). And of course our curated collection of vintage rhythm sounds spanning decades of electronic music. Carefully selected sounds sampled from iconic machines in our collection, offering producers access to rare and distinctive rhythms in one compact unit.

Professional Modification

Fully reversible installation maintains collector value

Professional servicing ensures reliable operation

Quality EPROM expansion from respected HKA Design

No external modifications preserve original aesthetics

Unique Sound Character

While EPROM storage limitations mean samples are optimized for punch over length (explaining why you won't get long/deep 808 kicks), this constraint actually enhances the machine's character, delivering the tight, focused sounds that made 1980s drum machines legendary.

Perfect For:

Vintage Synth Collectors seeking enhanced functionality

Electronic Music Producers wanting authentic vintage sounds

Hip-Hop & House Producers needing classic Roland rhythms

Sound Designers exploring unique vintage character

Recording Studios adding multiple professional vintage drum sounds in one unit

Technical Specifications

Brand: Roland (Modified by Soundgas)

Model: TR-707 Rhythm Composer with HKA Expansion

Year: 1980s (Recently Modified & Serviced)

Sound Banks: 8 Complete Banks (4 Classic Roland + 4 Exclusive Soundgas)

Power: 12V Centre Negative (Adapter Required)

Condition: Excellent - Freshly Serviced & Modified

Modification: Professional HKA EPROM Expansion with Soundgas Custom Banks

Warranty: Covered by Standard Soundgas Warranty

Ready to ship immediately - Professional packaging and fast dispatch guaranteed.

More detailed specifications and sound samples available upon request.

Condition

In exceptional overall condition cosmetically. Only very minor scuffs to the sides and corners of the unit with some minor discolouration in parts of the faceplate/back too. Please see photos or get in touch if you require more information on condition.

Voltage Information

See description for more information.

Tax

For sales in UK the price will include 20% VAT. Buyers elsewhere may incur VAT or other local taxes on import.