KORG BS-999 Mono Poly Analog Synthesizer Serviced 1980S Mono/poly MP-4

( Brand: Korg ), ( Model: BS-999 BASS SYNTHESIZER ), ( Country Of Origin: Japan ), ( Type: Keyboard Synthesizer ), ( Manufacturer Part Number: BS-999 )

Review KORG 1980mono/poly Mp-4 Vintage Analog Synthesizer Serviced

The Korg BS-999 MP-4 is a mono/poly analog synthesizer that was first introduced in the 1980s. This vintage synthesizer has been fully serviced to ensure optimal performance and reliability for modern music production and live performances.

At its core, the BS-999 MP-4 is a versatile and powerful instrument capable of generating a wide range of sounds, from rich and complex pads and leads to gritty and raw basses. It features a 4-voice polyphonic architecture, which allows for up to four notes to be played at once, as well as a monophonic mode for more traditional single-note synthesis.

The synth's sound engine is based on analog voltage-controlled oscillators (VCOs), filters, and amplifiers, providing a warm and rich tonal character that is unique to analog synthesizers. The BS-999 MP-4 comes with four selectable waveforms for each VCO, including sawtooth, square, triangle, and sine waves.

The synth's filter section is a 12dB/octave low-pass design that can be used in both normal and self-oscillating modes. It also features a selectable keyboard tracking mode, allowing for expressive and dynamic performances.

The BS-999 MP-4 also comes with a range of modulation sources, including an envelope generator, two LFOs, and a ring modulator, allowing for complex and intricate sound design possibilities. It also features a patch bay, which allows for easy routing of signals between various parts of the synth.

The synth's control surface is intuitive and user-friendly, with a 61-note velocity-sensitive keyboard, a variety of knobs and sliders for adjusting various parameters, and a clear and concise LED display for monitoring settings.

The BS-999 MP-4 has been fully serviced to ensure that all components are in good working order, and that any issues or faults have been addressed. This includes cleaning and lubricating the potentiometers, checking and adjusting the VCOs and filters, and testing all functions of the synth. The synth also comes with a new power supply and a user manual.

In conclusion, the Korg BS-999 MP-4 is a unique and powerful analog synthesizer that offers a wide range of sounds and capabilities, making it a valuable addition to any music production or live performance setup. With its fully serviced and restored condition, it is ready to provide many years of inspiring and creative music making.

The Korg BS-999 MP-4 is a mono/poly analog synthesizer produced by Korg during the 1980s. This instrument has gained popularity among synth enthusiasts for its unique sound and retro aesthetic. Here are some pros and cons to consider before purchasing a serviced Korg BS-999 MP-4:

1. Authentic Analog Sound: This synthesizer produces rich and warm analog sounds that are difficult to replicate digitally. It's ideal for musicians who want a classic, vintage synth tone.

2. Versatile: The BS-999 MP-4 has a dual-voice polyphonic mode and a monophonic mode, allowing it to cater to various musical styles and needs.

3. Customizable: With a wide range of controllable parameters, this synth offers plenty of room for experimentation and sound design.

4. Serviced: A serviced BS-999 MP-4 ensures that all components are functioning correctly and that any potential issues have been addressed.

5. Rare and Collectible: The BS-999 MP-4 is a sought-after vintage synthesizer. Owning one can be a significant addition to any synth collection.

1. Limited Connectivity: The BS-999 MP-4 has very limited connectivity options, with only a few outputs and no MIDI capabilities. This may not be suitable for modern production workflows.

2. Complex Interface: The synth's control layout can be overwhelming for beginners, making it a steeper learning curve compared to some modern synths.

3. Maintenance: As with any vintage hardware, the BS-999 MP-4 may require regular maintenance to keep it in working order.

4. Price: Serviced vintage synths can be quite expensive, especially for those in good condition.

The Korg BS-999 MP-4 is a unique and powerful analog synthesizer with a rich history and distinctive sound. Its versatility, customizability, and rarity make it an attractive option for synth enthusiasts and collectors. However, its limited connectivity, complex interface, and maintenance requirements, coupled with its relatively high price point, may not be ideal for beginners or those with more modern production workflows. Ultimately, the decision to purchase a serviced Korg BS-999 MP-4 comes down to personal preferences, musical style, and budget.

If you are a synth enthusiast or collector looking for a vintage analog synth with a unique sound and classic aesthetic, the Korg BS-999 MP-4 is an excellent investment. It offers a wide range of controllable parameters, allowing for extensive sound design possibilities. However, if you are just starting out in synthesis or require modern connectivity options, you may want to consider a more modern and user-friendly synth. Ultimately, it is essential to weigh the pros and cons carefully before making a decision.

part # bs999 price

• $2399.99

specifications synthesasha:

• brand: Korg
• model#: BS-999 BASS SYNTHESIZER
• country of origin: Japan
• type: Keyboard Synthesizer
• manufacturer part number: BS-999

seller synthesasha:

• # reviews: 3744
• rating: 100.0%

offer synthesasha:

• quantity: 1
• options: Ship-to-home
• sold: 0
• started: November 25, 2025
• availability: In Stock

returns synthesasha:

• policy: No Returns

shipping synthesasha:

• class: Expedited
• transit: 4-10 Days
• cost: $150.00
• service: FedEx Express Saver
• carrier: FedEx
• type: Fixed

general synthesasha:

• Musical Instruments Gear > Pro Audio Equipment > Synthesizers
• condition: Used

payments synthesasha:

• other
• wallet: Apple-pay
• credit card: Visa

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