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Page 2: ...ower Up Procedure 4 SQ816 Panel Layout 5 Definitions 6 Timing Section 8 Stage Control Section 10 Stage Matrix 11 Response Control Section 13 Output Section 14 Interface Section 16 User Programmable Functions 17 Adjustments and Trim Procedures 22 Ver 1 27 2013 02 01 ...
Page 3: ...6 is the result of that determination I designed the hardware and incorporated the help of Division 6 to write and implement the software to create a truly amazing step sequencer The SQ816 is designed to be primarily utilized as a CV Gate controller There are numerous inputs and outputs to help facilitate stand alone operation with virtually any analog CV Gate synthesizer system and expansion inte...
Page 4: ...em power bus If your power distribution headers aren t keyed verify the stripe location prior to connecting The stripe indicates the negative voltage V The SQ816 sequencer clock is calibrated for the power scheme utilized based on the format provided The only effect of using a higher or lower voltage power supply is that the lower the power supply voltage the faster the VC clock will cycle and it ...
Page 5: ...5 SQ816 Panel Layout ...
Page 6: ...or to the stage set as Start and then return to the beginning when the sequence is started In Loop mode the beginning is the first stage of a local sequence In 1X mode the beginning is assumed to be off system The sequence will truncate generate an XP out pulse and enter Ready Mode Last stage The last stage of a programmed sequence before repeating changing direction or going into Ready Mode ROG R...
Page 7: ...on Usually selected by programming in Ready mode Clock Timing device for determining the stage advance rate An external clock applied to the Ext Clk input interrupts and replaces the internal VC clock The Tap Tempo feature interrupts and replaces the internal VC clock or the external clock Quantize Linear Linear mode allows for a continuous sweep from 0 3 Volts using the control knob for a stage N...
Page 8: ...ogrammed and the LED color will indicate one of the following Green Internal VC Clock or external clock at the Ext Clk In jack is in control of the stage advance timing The LED flashes at stage advance clock rate Yellow Indicates user programmed Tap Tempo control of the stage advance VC internal and external clocks are disabled Red Indicates that the main gate output is disabled muted either from ...
Page 9: ...tion for more detail on the ROG Input Footswitch An input jack for a normally open shorting type footswitch It performs the same function as the pushbutton See the User Programmable Functions section for more detail on using the Footswitch input USB See the Interface Section for more details ...
Page 10: ...on press The Gate is activated to assist with settings The ROG position is also for program selection and utilizing ROG mode Fwd PP Rnd Rev switch Main directional control The switch position is also used as a bank pointer during specific user program functions Note If the SON SOS switch is in the SOS position the sequence will double hit the beginning and endpoints of the sequence while in Ping P...
Page 11: ...ow in 16 channel mode Stages 9 16 are active CV B setting is applied to the CV A output Red The Main Gate and or the Stage Gate is not generated for that stage Effectively used for a stage mute CV A row Used for selecting stage CV output start point or main gate and stage gate mute Row A is active during stage 1 8 operation Fully CCW to slightly CW sets the Start Stage The Status LED will flash at...
Page 12: ...step sequence where Row CV A controls the CV A output and Row B controls the CV B output During 16 channel operations the CV B row controls stages 9 16 and the CV output is routed to the CV A output Think of this as a 1 x 16 step sequence with the CV for all 16 stages going to the CV A output The zone position controls for Row B are enabled and the Stage LED will light yellow to indicate the CV B ...
Page 13: ...mode until reset In the 1X mode an XP Out pulse is generated at the last stage 1 clock cycle Loop mode The sequence will restart to the beginning after the last stage is reached No XP out pulse is generated in loop operations SOS SON select switch Control for determining how the sequencer starts Also used when toggled back and forth within one second to invoke user programs SOS Start On Stage When...
Page 14: ...te the Main Gate output The clock LED will be red Pushbutton mutes will not hold the last valid stage value at the CV output In PP Rnd mode Ping Pong Random each button press toggles between Ping Pong and Random stage generation When returning to Ping Pong from Random the sequence will start on the stage and direction it was on when Random was invoked When switching between Ping Pong and Random ho...
Page 15: ...output bank The MIDI output provides MIDI note values based on the active stage setting The note values are not affected by any of the CV inputs CV A X In CV B X In CV In CV Amt CV Offset VAR X In The MIDI values are generated based on the CV A and CV B output bus active in 8 or 16 channel mode In 8 channel mode the MIDI is generated based on the CV A setting for one note and CV B for the second n...
Page 16: ... send back to the beginning stage regardless of current stage position XP Out eXPansion out Generates a start pulse at the end of a sequence 1 clock pulse useful for starting another sequencer in time If the SQ816 sequencer is in 1X mode patching XP out to XP in essentially performs the same function as Placing the Loop 1X switch in the Loop position Footswitch See Footswitch in the User Programma...
Page 17: ...17 User Programmable Functions ...
Page 18: ...s turn off the SQ816 power put ALL switches in the up position then press and hold the Lots of Stuff Pushbutton while restoring power ROG Run On Gate The SQ816 sequencer holds and waits on an active stage No gates are generated and the SQ816 sequencer advances at the clock rate only when a gate 5V or greater is present at the ROG Input jack The SQ816 stops when the gate at the ROG Input drops back...
Page 19: ... Volt This will raise the pitch of a specified output bank up one octave Selecting the octave offset again will remove the offset Default No offset To activate place the SQ816 in Ready mode no stages active Set the Run Stop Reset pROG switch into the down pROG position Use the Fwd PP Rnd Rev switch to select the desired bank to change FWD A PP RND both A and B REV B and then toggle the SOS SON swi...
Page 20: ...for 1 second green for 1 second and yellow for 1 second indicating a stage swap or two stage operation Quantize The CV A and CV B outputs on the SQ816 sequencer are linear voltages Adjusting the active stage control will sweep continuously from 0V to 3V producing a three octave range based on the standard 1V Octave output scheme To assist in setting the outputs to drive oscillators in discreet sem...
Page 21: ...LEDs will light green and scan from Stage 1 to Stage 8 Notes The MIDI Note Off command follows the Gate Length setting If a stage is set to Stage Mute no MIDI data is generated for that stage Run mute operations will suppress MIDI note generation while the Run Mute is active Run Mute During run operations the main gate output can be muted by pressing and holding the Lots of Stuff pushbutton This d...
Page 22: ...ion If the jumper is installed on the center and right pins Alt position the SQ816 Sequencer will accept a N C footswitch Actually in this mode the SQ816 will determine which type of footswitch is connected to the Footswitch input jack and configure its operation accordingly This is the current original stock Alt Footswitch function Future software revisions may change the Alt Footswitch function ...
Page 23: ...ould be flashing yellow at the tapped rate The yellow color is determined by the balance of the red and green LEDs combined Re adjust R121T cRD and R120T cGN until the combination is yellow or suitable to your preference Hold the push button for 5 or 6 seconds until the clock LED flashes green at the internal clock rate indicating the exit from Tap Tempo mode 3 Stage LED Green brightness A stage s...
Page 24: ...you have the need to perform fine adjustments to make it perform accurately with your system Steps 7 and 9 compensate the final CV output amplifiers on each bus for the inherent inconsistencies of the CV Amount control Potentiometers don t necessarily have a perfect 0 Ohm connection to the ends of the resistive element when they re fully rotated to the stops and there is usually a small amount of ...
Page 25: ... with the VCO Press a key or increase your 1V O source to C up three or 4 5 or 6 octaves Adjust R126T CV B until the VCO is tuned to C three or 4 5 or 6 octaves above the reference VCO Essentially it s the same procedure as step 7 but this step adjusts the CV B output 10 CV B X In Adjust This is the same procedure as step 8 Only it calibrates the CV B external input Remove the 1V O CV from the CV ...
Page 26: ...l from the low end of the active range to the high end of the active range Although we have specified using a low C as a reference it doesn t really matter what pitch you choose As long as the ranges match from the lowest to the highest We ve adjusted the DAC for a 3V or 3 octave range when controlling 1V O devices However you could stretch or compress those values for experimental purposes or to ...
