Behringer BQ-10

• Analog Sequencer
• Clone of the Korg SQ-10 analog sequencer (1978)
• 3 CV rows with 8 steps
• Voltage range 1V, 2V, 5V (Oct/V) or 8V (Hz/V) switchable per row
• 8 sequencer modes
• internal clock generator
• Portamento for row A & B
• adjustable gate length (duty)
• integrated MS-02 CV/Trigger interface with Hz/V to Oct/V & Oct/V to Hz/V conversion, adding amp and 2 trigger processors
  
• Sync Source (int / ext / MIDI / Trig) with Sync Divider
  
• Clock / Reset / St_St / Step control voltage inputs
• Multiple Trigger-Out + 8 Step Trigger Out
• 3 CV outputs for rows A/B/C
  
• Sync In / Out
• MIDI In / Out / Thru
• USB MIDI

8 steps in an endless loop

The BQ-10 has three identical rows of controls (tracks), each with 8 steps and the option of switching the voltage range between 1V, 2V, 5V (Oct/V) or 8V (Hz/V). The latter is particularly useful if you own an original Korg MS-20 or Behringer K-2 Mk1. The 8 sockets below the sequencer steps emit a trigger as soon as the step is played.

The Sequence Mode switch provides the necessary variety and combines channels A and B to a total of 16 steps in seven variants including random. Channel C runs independently and synchronously in all modes. In three-channel mode, each channel runs independently and has a length of 8 steps. The historical model of the BQ-10 comes from a time when pauses and different note lengths within a sequence were not a matter of course, so this sequencer generates a gate on EVERY step; only the general gate length can be set with DUTY.

The many analog voltage inputs and outputs invite you to operate the BQ-10 in an analog setup. or Eurorack modular system, especially the K-2 MkII synthesizer or an analog synth from the last 40 years; here techno, acid and electronic are guaranteed at the touch of a button. Depending on the selected sequence mode, the BQ-10 outputs rows A and B via MIDI on the same or two consecutive MIDI channels.

Useful converter for control voltages & triggers

The right side of the front panel contains the MS-02 CV/Trigger Interface, here called Trigger Processor. With this additional device, which was available separately at the time, it was possible to convert control voltages and triggers so that other analogue respectively modular synthesizers were compatible with the SQ-10 and the Korg synthesizers MS-10, MS-20 and MS-50. The Trigger Processor has the following four functions:

• Log Amp (conversion from Hz/V to Oct/V) - Hertz characteristic on Eurorack
  
• Antilog Amp (conversion from Oct/V to Hz/V) - Eurorack 1V/Oct to Hertz/V (e.g. for Behringer K-2 Mk1 and an original Korg MS-20)
  
• Adding Amp - CV mixer with two normalized fixed voltages (+5V & -5V), voltage doubling and mix output
  
• 2 trigger processors for adjusting trigger voltages and reversing polarity