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RS-450 CV Recorder

Analogue Systems

  • $ 1,29995

IMPORTANT: Analogue Systems modules have their own power cable that may or may not be compatible with your eurorack case.  Click this link for an installation guide.

Multi-channel CV Recoder for voltages, gates and triggers

  • 36 hp
  • 3.1 inches Depth
  • Requires +5V

The rs450 cv recorder is both a multi channel realtime control voltage recorder as well as a audio waveform sampler when used in its real time mode, in its step time mode it operates as a step time recorder of control voltages similar in operation to sequencers as used in synthesizers such as the roland sh101, the module has ten independant memories with four seperate channels per memory giving a total of fourty stored sequences. there is also a pseudo fifth channel primarily dedicated to recording clocks and triggers, these sequences can be either recorded in real time or step time and can be changed on the fly during playback which allows very complex sequences and evolving patterns to be created. the total recording time depends on the type of sequence, the number of channels and the bit rate selected, with the 4gig memory card the module is supplied with a four channel real time sequence running at the fastest bitrate (14k) will give about fourty mins recording time while in step time recording time runs into days.

4gig SDHC removable memory card for data storage. the memory card can be removed by the user and by using online with a card reader allows the module to receive firmware upgrades, also diferent memory cards can be fitted to allow users to keep their favorite sequences/recordings.


  • Start - initiates the playback of a stored sequence
  • Stop - stops a sequence that is playing back
  • Record - a single press of the record button puts the module into cv in monitor mode, this means any voltage appearing at a input is also sent to the coresponding output, the record buttons red l.e.d flashes to indicate the module has entered this mode, a second press of the record button starts the module recording and the l.e.d will remain constantly on while the module remains in record mode.
  • Rest/Reset - during the recording of a step time sequence the rest/reset button puts a rest into the sequence, during playback of either a real time or step time sequence this button forces the sequence to reset back to its start point, the rest/reset buttons l.e.d will light to show that either of these things have occured as well as on play back of a step time sequence it will light each time a rest is reached in a sequence.


Frequency - this adjusts the bitrate of a real time recording and thus acts as the playback speed control, there is also a input socket allowing voltage control of this function. this pot and socket have no function in step time mode Seq Start - during playback this pot allows the start point of the sequence to be altered, there is also a socket allowing voltage control of function. this works both for real time and step time recordings Seq End - during playback this pot allows the end point of the sequence to be altered, there is also a socket allowing voltage control of this function, this works both for real time and step time recordings.


Playback switches

  • Single - sequence plays once and then stops until a start command is received whereupon it will play once more etc
  • Rpt - sequence plays as a loop repeating until a stop command is received
  • Hold - the sequence plays as in Rpt mode but if a stop command is received the sequence stops at the point it had reached and upon receiving a start command will continue running from the point at which it had stopped.
  • Forward - the sequence will play in the forward direction
  • Reverse - the sequence will play in reverse direction
  • Bi-dir - the sequence will play forwards until it reaches the end then it will play backwards etc.

Sequencer mode switch
  • Step Time - In this mode the module operates by storing a fixed control voltage into a single memory location each time a clock pulse is received. for example the clock could be a gate pulse from a keyboard and the keyboard voltage output can then be recorded into a memory channel thus it becomes a basic step time sequencer. a external clock or lfo is then used to play back the stored sequence, a more complex use in step time mode would be to connect the 4 channel outputs to the cv inputs of vco/vcf/vca/etc and then any voltages recorded/stored in the memory would become preset stores for sound patches in a modular synthesizer and by linking two RS 450s together 8 parameters of a synthesizer would be able to be stored as presets, there are many interesting ways to use step time mode and more details of these will be given in the user manual.
  • Real Time - in this mode the module operates as a real time sampler for both control voltages or audio waveforms, the speed is controlled by the bitrate pot which is also voltage controllable thus allowing very complex possibilities of usage, the four channels can be either recorded simultaneously or singly to allow a multitrack sequence to be created, upon playback the channels can be turned on and off on the fly allowing complex patterns to be created.

Trigger mode switch
  • IND TRIGGER - A trigger on START starts playback; a trigger on STOP stops playback. a trigger on RECORD puts the module into record mode.
  • SR TRIG - A trigger at START starts the sequence another trigger on START stops the sequence etc, a trigger on RECORD puts the module into record mode and another trigger on record takes the module out of record mode etc, STOP does nothing.
  • SSR GATE - A gate voltage at START causes the module to run, when this gate voltage is removed the seq stops, a gate voltage at record causes the module to go into record mode and the module comes out of record mode once this gate voltage is removed. a trigger/gate at STOP causes the module stop.

    Ten recordings can be stored, selectable by the memory switch. each of the ten memory positions can have up to four channels of diferent voltages recorded into it, these memories are none volatile so are remembered after the module is powered down or if the card is removed.

    Clock In - In step time mode this socket functions as the input for the clock being used to record and play back a step time sequence, for example either from a kbd gate out, a lfo or a analogue sequencer trigger output. In Real Time mode it is not required as real time sequences derive their running clock from the module itself, however it can be used as a fifth recording channel input to allow real time clocks and gates to be recorded without using one of the four main channels for this purpose.

    Clock Out - In step time record mode any clock pulse sent to the clock input socket is also sent to this output socket, in Real Time playback mode this socket outputs whatever was recorded into it.

    Rest/Reset - during playback a pulse at this input socket resets the sequence back to its start point but does not stop playback. during recording of a step time sequence a pulse at this input socket will put a rest into the sequence.

    CV Outs - During recording these output sockets allow the voltage being recorded at the matching input to pass straight through to allow real time monitoring of the voltage being recorded. In step time recording mode while recording the outputs change on each clock gate allowing monitoring of what is being recorded. during playback any or all channels can be turned on and off allowing complex sequence patterns to be created.

    PCB Power Sockets - Features both Analogue Systems and Doepfer style ribbon connectors.

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