Scrolls
Motion Controlled Dual Ramp Generator

Scrolls is a motion controlled dual ramp generator module for EuroRack video synthesizers. It provides the synthesist with full control over the screen positioning of its high precision HD/SD dual video waveform generators. Frontpanel switches provide access to 72 combinatorial states addressing movement speed, waveform blanking and mirroring, and advanced motion paths from elliptical orbit to random exploration.

    Motion Control In Two Dimensions

    Most analog video synthesis patches begin with horizontal and vertical ramp waveforms. These generators provide the synthesist with a method of identifying 2D coordinates on the screen. With motion controlled ramps, these 2D coordinates can be repositioned and animated at their source – causing the entire resulting video art pattern to animate.

    Dedicated Low Frequency Outputs

    In addition to motion control over the internal video waveforms, Scrolls presents four dedicated low frequency waveform generators. These signals are synchronous with the movement of the internal ramps, and provide ways to animate other parts of your patch in tempo with the video pattern.

    Autonomous Animation Paths

    Random and Journey modes provide methods for generating the illusion of autonomous entities within the space of your video composition. Watch your video pattern slowly explore around the screen at random directions, or teleport in strobing patterns of random phases. In all of these modes, the synthesist has control over a basic clock speed, which allows even chaos to step to the beat.

    Dimensions

    Width, 12HP
    Mounting Depth, 32mm

    Video Sync

    Rear RCA Sync Input Jack
    Rear RCA Sync Output Jack

    Power Consumption

    +12V @ 150mA

    Power Entry

    Rear DC Barrel Jack
    Rear EuroRack 16 Pin Header

    Legend

    J1
    J10
    J11
    J12
    J13
    J14
    J2
    J3
    J4
    J5
    J6
    J7
    J8
    J9
    P1
    P2
    P3
    P4
    S1
    S2
    S3

    Connectors

    J1
    Phase 1 CV Input Input
    J10
    Pulse 2 Output Output
    J11
    Saw 1 Output Output
    J12
    Tri 1 Output Output
    J13
    Saw 2 Output Output
    J14
    Tri 2 Output Output
    J2
    Phase 2 CV Input Input
    J3
    LFO 1A Output Output
    J4
    LFO 1B Output Output
    J5
    LFO 2A Output Output
    J6
    LFO 2B Output Output
    J7
    Ramp 1 Output Output
    J8
    Pulse 1 Output Output
    J9
    Ramp 2 Output Output

    Controls

    P1
    Phase 1
    P2
    Phase 2
    P3
    Phase CV Depth 1
    P4
    Phase CV Depth 2
    S1
    Speed Mode
    S2
    Waveform Mode
    S3
    Primary Mode

    Downloads

    Scrolls Firmware 1.0.1 (ZIP)

    Patching Tips

    HH. Double Horizontal Mode

    Both waveform generators are horizontal ramps with separate phase controls.

    VV. Double Vertical Mode

    Both waveform generators are vertical ramps with separate phase controls.

    HV. Horizontal & Vertical Mode

    The first ramp generator is horizontal and the second ramp generator is vertical.

    PP. Ping Pong Mode

    The first ramp generator is horizontal and the second ramp generator is vertical. The motion control algorithm uses triangle waveforms, for the bouncing DVD player logo effect.

    O. Orbital Mode

    The first ramp generator is horizontal and the second ramp generator is vertical. The motion control algorithm uses a quadrature sine wave generator to animate the ramps in an elliptical orbit. Phase1 controls motion speed and Phase2 controls motion depth.

    J. Journey Mode

    The first ramp generator is horizontal and the second ramp generator is vertical. The motion control algorithm is similar to HV mode, but the manner in which the speed and direction of movement is based on polar instead of cartesian coordinates. Phase1 controls motion angle and Phase2 controls motion velocity.

    C. Corner Mode

    The first ramp generator is horizontal and the second ramp generator is vertical. The motion control algorithm is similar to O mode, but utilizes trapezoidal rather than sinusoidal waveforms. Phase1 controls motion speed and Phase2 controls motion depth.

    R?. Random Mode

    The first ramp generator is horizontal and the second ramp generator is vertical. The motion control algorithm is different depending on whether Phase2 is counter-clockwise or clockwise from it's midpoint. The clockwise position is random position and speed and the counter-clockwise position is random angle of movement. Phase1 controls motion speed and Phase2 controls motion depth.

    Speed Mode

    There are three motion speed modes. From toggle switch positions, left to right: Motion Disabled, Slow Range, Fast Range.

    Waveform Mode

    There are three waveform modes. From toggle switch positions, left to right: Wrap, Blank, and Mirror. In Wrap mode, the ramp phase scrolls continuously, repeating across the screen. In Blank mode, the ramp phase may be moved entirely off screen. In Mirror mode, the ramp phase inverts on even numbered cycles, creating an oversized quadrilateral space that is 2x2 screens in size. When used in HD timing formats, there will be a 20ns black line present when the ramp reflects from positive to negative slopes. This is expected behavior.

    System Building Tips

    Should I Update My Firmware?

    If your serial number is below #50, you should update your firmware to version 1.0.1, available for download on this page. This will fix compatibility issues with progressive sync timings. Firmware update instructions are included in the download.