slewswitch

slewSwitch · utility · schema v1

Quad slew limiter combined with a 4→1 sequential CV switch. Four CV inputs each pass through an independent slew limiter (per-channel time constant 1 ms–5 s, CV-controllable) for portamento / smoothing, available on out1–out4. A step_clock gate advances a sequential switch that selects among the (slewed) channels and presents the result on `switched`, with a LENGTH (1–4) and MODE control, a crossfade time between selections, a reset gate, a step_idx CV, and an end-of-cycle (eoc) gate. One of the three ATLANTIS-PATCH support modules; broadly useful as a general CV smoother + router.

Two CV utilities in one: a four-channel SLEW LIMITER and a 4-to-1 sequential SWITCH. The slew side smooths each of the four CV inputs independently — its per-channel slew time controls how long the output takes to glide to a new value (a portamento / lag for pitch, an envelope-rounder for gates, a smoother for any steppy CV). The switch side scans those same four slewed channels one at a time: each rising edge at the CLOCK input advances the selection, and the SWITCHED output carries whichever channel is currently chosen (with an equal-power crossfade between channels so the hand-off is glitch-free). The scan can run forward, pendulum (ping-pong) or random, over a settable length of 1-4 steps; a STEP IDX output and an end-of-cycle pulse round it out. The four direct OUT jacks are always live regardless of the switch. The slew + switch math runs in a DSP worklet.

the faceplate

10 inputs · 7 outputs · 7 params

about this module

Hover a control, or open the patch panel and hover a jack.

inputs

id	cable	what it does
`in1`	cv	Channel 1 CV input into the slew limiter (smoothed by the S1 time). Available at OUT 1 and selectable by the switch. control voltage (CV)
`in2`	cv	Channel 2 CV input into the slew limiter (smoothed by S2). control voltage (CV)
`in3`	cv	Channel 3 CV input into the slew limiter (smoothed by S3). control voltage (CV)
`in4`	cv	Channel 4 CV input into the slew limiter (smoothed by S4). control voltage (CV)
`step_clock`	gate	The switch advance clock — each rising edge steps the 4-to-1 sequential switch to the next channel (per the Mode and Len settings). Leave unpatched and the switch holds on its current channel. gate / trigger
`reset`	gate	Resets the switch index back to channel 0 on each rising edge, re-syncing the scan to the start of its cycle. gate / trigger
`slew1_cv`	cv	CV that sums into the S1 slew-time amount (log-scaled), modulating how fast channel 1 glides. control voltage (CV); modulates slew1 (multiplicative ≈ octaves — ±1 CV spans the param’s log range)
`slew2_cv`	cv	CV that sums into the S2 slew-time amount (log-scaled). control voltage (CV); modulates slew2 (multiplicative ≈ octaves — ±1 CV spans the param’s log range)
`slew3_cv`	cv	CV that sums into the S3 slew-time amount (log-scaled). control voltage (CV); modulates slew3 (multiplicative ≈ octaves — ±1 CV spans the param’s log range)
`slew4_cv`	cv	CV that sums into the S4 slew-time amount (log-scaled). control voltage (CV); modulates slew4 (multiplicative ≈ octaves — ±1 CV spans the param’s log range)

outputs

id	cable	what it does
`out1`	cv	Channel 1 slewed CV — in1 smoothed by the S1 slew time. Always live, independent of the switch. control voltage (CV)
`out2`	cv	Channel 2 slewed CV (in2 smoothed by S2). control voltage (CV)
`out3`	cv	Channel 3 slewed CV (in3 smoothed by S3). control voltage (CV)
`out4`	cv	Channel 4 slewed CV (in4 smoothed by S4). control voltage (CV)
`switched`	cv	The 4-to-1 switch output: the slewed signal of the currently-selected channel, with an equal-power crossfade (the Xfd time) on each switch so transitions don't click. control voltage (CV)
`step_idx`	cv	The current switch index as a CV, mapped to -1..+1 across the active channels — for driving a display or for downstream addressing of the scan position. control voltage (CV)
`eoc`	gate	End-of-cycle: a short (~5 ms) gate pulse each time the switch WRAPS back to channel 0 (in random mode it pulses on every step). Chain it to another clock/reset to daisy-chain cycles. gate / trigger

params

id	label	range	default	curve
`slew1`	S1	0.001..5s	0.5	log
`slew2`	S2	0.001..5s	0.5	log
`slew3`	S3	0.001..5s	0.5	log
`slew4`	S4	0.001..5s	0.5	log
`mode`	Mode	0..2	0	discrete
`length`	Len	1..4	4	discrete
`xfadeTime`	Xfd	0.001..2s	0.05	log

controls

control	what it does
Len	How many channels the switch scans, 1-4 (a cycling LEN button). A length of 2, for example, ping-pongs/cycles only channels 0-1 and ignores 2-3. Default 4.
Mode	The switch scan pattern (a cycling button on the card): FWD = forward 0→1→2→3→0…, PND = pendulum / ping-pong 0→1→2→3→2→1→0…, RND = random (a new channel each clock, never repeating the previous). Default FWD.
S1	Channel 1 slew time, log 0.001..5 s (default 0.5 s) — how long OUT 1 takes to glide to a new value. Short = snappy/near-instant, long = a slow lag/portamento. Sums with the S1 CV input.
S2	Channel 2 slew time, log 0.001..5 s (default 0.5 s). Sums with the S2 CV input.
S3	Channel 3 slew time, log 0.001..5 s (default 0.5 s). Sums with the S3 CV input.
S4	Channel 4 slew time, log 0.001..5 s (default 0.5 s). Sums with the S4 CV input.
Xfd	The equal-power crossfade time applied to the SWITCHED output when the selection changes, log 0.001..2 s (default 0.05 s). Short = a tight switch, long = a slow morph between the two channels' values.

source

slewswitch.ts on GitHub.