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Author Buchla 245/ 246 Sequencer
Robbot
 Forgive my ignorance here but I would be grateful for any help with this please. I understand that the 245 /246 models have 2 separate (and not electronically related) sections. The left section is a pulser section and the rest is the 5 or 16 knobs and pulse outs of the sequencer section. The Pulser can be patched to the Sequencer section (and vice-versa). I understand using the CV controllable Pulse Length and Pulse Time functions. But please could someone explain what the "Ref" does? And how it could be usefully used (either for sequencing or as an envelope, which I understand these can be used to create). It is an output. And what does the "Analog" do? It is an input - black CV banana jack. I was wondering whether the analog could be used as a reference to increase / decrease the voltages from the 4 rows of sequencer knobs. But it doesn't seem to do this. E.g. If the top row was assigned to Osc pitch, it could move those up a 5th if a the equivalent CV was added into the "Analog" input... Many thanks.
thermionicjunky
 That's an analog address input, so the programmed voltages can be used like an arbitrary transfer function.
Robbot

I'm a bit of a newb when it comes to complicated analogue sequencers. Does this mean that a voltage applied to the "Analog" will make the sequencer arbitrarily move from whatever step it is on to some other step? Even if the sequencer is under pulse control which would otherwise make it move along in a linear fashion (1>2>3>4>5 etc)?

 thermionicjunky wrote: That's an analog address input, so the programmed voltages can be used like an arbitrary transfer function.
thermionicjunky
 Robbot wrote: Many thanks for your reply. I'm a bit of a newb when it comes to complicated analogue sequencers. Does this mean that a voltage applied to the "Analog" will make the sequencer arbitrarily move from whatever step it is on to some other step? Even if the sequencer is under pulse control which would otherwise make it move along in a linear fashion (1>2>3>4>5 etc)?

Generally, address inputs go through some kind of window comparator string, so the control range is split into as many bands as there are steps. Low voltage selects stage 1, a slightly higher voltage selects stage 2, etc. If the pulse input is also used, I would expect the sequencer to advance one step from the position selected by the address input.
Robbot
Thanks - sounds very interesting. Will do some experimenting and confirm if it does.

Any idea about the "Ref" output though?

thermionicjunky wrote:
 Robbot wrote: Many thanks for your reply. I'm a bit of a newb when it comes to complicated analogue sequencers. Does this mean that a voltage applied to the "Analog" will make the sequencer arbitrarily move from whatever step it is on to some other step? Even if the sequencer is under pulse control which would otherwise make it move along in a linear fashion (1>2>3>4>5 etc)?

Generally, address inputs go through some kind of window comparator string, so the control range is split into as many bands as there are steps. Low voltage selects stage 1, a slightly higher voltage selects stage 2, etc. If the pulse input is also used, I would expect the sequencer to advance one step from the position selected by the address input.
thermionicjunky
 Robbot wrote: Thanks - sounds very interesting. Will do some experimenting and confirm if it does. Any idea about the "Ref" output though?

According to the 246 schematic, it's a signal coming from the clock before it reaches the pulse-width comparator.
Robbot
Thanks. Perhaps it means 'Reference'?
Any ideas on how it can be used interestingly with the sequencer?

I gather that the sequencer can also be used as a quantizer but I'm still scratching my head a little there :-)

thermionicjunky wrote:
 Robbot wrote: Thanks - sounds very interesting. Will do some experimenting and confirm if it does. Any idea about the "Ref" output though?

According to the 246 schematic, it's a signal coming from the clock before it reaches the pulse-width comparator.
thermionicjunky
 Robbot wrote: Thanks. Perhaps it means 'Reference'? Any ideas on how it can be used interestingly with the sequencer? I gather that the sequencer can also be used as a quantizer but I'm still scratching my head a little there :-)

Yeah, I would guess "reference clock"

Patching a CV to the analog input will quantize it to the programmed voltages.
solaris
from the brochure:

 Quote: The Sequential Voltage Source is an analogue memory for storing and retrieving control voltages. It includes an electronically separate pulse generator with voltage controlled period and pulse length (duty cycle). The Model 246 produces up to 16 programmed voltages at each of four outputs. The Sequencer employs three methods of selecting stages; pulse advancing, analogue selection, and pulse selection. All can be used simultaneously or in any desired combination. Pulse advancing is used for generating sequences of control voltages. A pulse derived from the self contained pulser or from an external source advances the sequencer one step. sequencers may be cyclic over a number of stages or may be single shot, beginning and ending on any desired stage. Sequence boundaries are established by switches located between stages. An analogue select input permits the value of an applied control voltage to determine the activated stage. Higher voltages select higher numbered stages; zero volts enables the pulse advance and pulse select inputs. Analog selection is particularly useful for converting a continuous voltage (from an envelope Generator or detector or a random voltage source) into a series of pre selected values (a 12 tone scale for example). It also enables indirect addressing by another sequencer and facilitates simple (one patchcord) extension of the Model 217 Keyboard's number of programmable outputs to 5. The sequencer may be employed as a preset controller (a random access memory), with pre selected parameter values recalled by applying a pulse to the input of the desired stage. This pulse selection, used in conjunction with pulse advancing, allows several transient or cyclic sequences (different rhythms, for example) to be simultaneously programmed. A desired program might be initiated by pulses from a keyboard or another sequencer. Light emitters and pulse outputs are energized as corresponding stages are actuated. The period of the self contained, voltage controlled pulser has a range of .005 to 10 seconds. Pulse width can be varied from 1% to 100% of the period.
boops
solaris wrote:
from the brochure:

 Quote: The Sequential Voltage Source is an analogue memory for storing and retrieving control voltages. It includes an electronically separate pulse generator with voltage controlled period and pulse length (duty cycle). The Model 246 produces up to 16 programmed voltages at each of four outputs. The Sequencer employs three methods of selecting stages; pulse advancing, analogue selection, and pulse selection. All can be used simultaneously or in any desired combination. Pulse advancing is used for generating sequences of control voltages. A pulse derived from the self contained pulser or from an external source advances the sequencer one step. sequencers may be cyclic over a number of stages or may be single shot, beginning and ending on any desired stage. Sequence boundaries are established by switches located between stages. An analogue select input permits the value of an applied control voltage to determine the activated stage. Higher voltages select higher numbered stages; zero volts enables the pulse advance and pulse select inputs. Analog selection is particularly useful for converting a continuous voltage (from an envelope Generator or detector or a random voltage source) into a series of pre selected values (a 12 tone scale for example). It also enables indirect addressing by another sequencer and facilitates simple (one patchcord) extension of the Model 217 Keyboard's number of programmable outputs to 5. The sequencer may be employed as a preset controller (a random access memory), with pre selected parameter values recalled by applying a pulse to the input of the desired stage. This pulse selection, used in conjunction with pulse advancing, allows several transient or cyclic sequences (different rhythms, for example) to be simultaneously programmed. A desired program might be initiated by pulses from a keyboard or another sequencer. Light emitters and pulse outputs are energized as corresponding stages are actuated. The period of the self contained, voltage controlled pulser has a range of .005 to 10 seconds. Pulse width can be varied from 1% to 100% of the period.

Thanks ..as atm i build 3x 245
Càn be useful indeed
Robbot
That's very helpful - thank you all.

boops wrote:
solaris wrote:
from the brochure:

 Quote: The Sequential Voltage Source is an analogue memory for storing and retrieving control voltages. It includes an electronically separate pulse generator with voltage controlled period and pulse length (duty cycle). The Model 246 produces up to 16 programmed voltages at each of four outputs. The Sequencer employs three methods of selecting stages; pulse advancing, analogue selection, and pulse selection. All can be used simultaneously or in any desired combination. Pulse advancing is used for generating sequences of control voltages. A pulse derived from the self contained pulser or from an external source advances the sequencer one step. sequencers may be cyclic over a number of stages or may be single shot, beginning and ending on any desired stage. Sequence boundaries are established by switches located between stages. An analogue select input permits the value of an applied control voltage to determine the activated stage. Higher voltages select higher numbered stages; zero volts enables the pulse advance and pulse select inputs. Analog selection is particularly useful for converting a continuous voltage (from an envelope Generator or detector or a random voltage source) into a series of pre selected values (a 12 tone scale for example). It also enables indirect addressing by another sequencer and facilitates simple (one patchcord) extension of the Model 217 Keyboard's number of programmable outputs to 5. The sequencer may be employed as a preset controller (a random access memory), with pre selected parameter values recalled by applying a pulse to the input of the desired stage. This pulse selection, used in conjunction with pulse advancing, allows several transient or cyclic sequences (different rhythms, for example) to be simultaneously programmed. A desired program might be initiated by pulses from a keyboard or another sequencer. Light emitters and pulse outputs are energized as corresponding stages are actuated. The period of the self contained, voltage controlled pulser has a range of .005 to 10 seconds. Pulse width can be varied from 1% to 100% of the period.

Thanks ..as atm i build 3x 245
Càn be useful indeed
lucringeisen
 So how do you send an external clock ? is it via the "ref" input ?
lucringeisen
 is it actually possible to send an external clock into the 245 ? if yes what is the actual input on the panel ? thanks in advance for the info !
cygmu
 lucringeisen wrote: is it actually possible to send an external clock into the 245 ? if yes what is the actual input on the panel ? thanks in advance for the info !

I see what you did there.
Peake
 The pulser is a clock probably with a sawtooth core, squared for use to advance stages etc. REF is the falling saw output of the Pulser, same phase/frequency as the square, so it can be used as a secondary modulation source. You can use it as a falling slew to control LPGs for example. Don't forget the pulse inputs along the bottom which allow non-linear stage selection via gates.
lucringeisen
cygmu wrote:
 lucringeisen wrote: is it actually possible to send an external clock into the 245 ? if yes what is the actual input on the panel ? thanks in advance for the info !

I see what you did there.

uff nana YOU did that ))
lucringeisen
 Peake wrote: The pulser is a clock probably with a sawtooth core, squared for use to advance stages etc. REF is the falling saw output of the Pulser, same phase/frequency as the square, so it can be used as a secondary modulation source. You can use it as a falling slew to control LPGs for example. Don't forget the pulse inputs along the bottom which allow non-linear stage selection via gates.

right of course those inputs at the bottom, thanks man
Pailo
 Peake is right, mine 245r is a saw