Bucket Brigade Delaylines 4

Four lines of bucket brigade delay are in one module. You can get tempo synced delay effect easily with quantized grid. Each line has a built-in lowpass filter independently. Key parameters can be modulated with CV signals.

Buffer Size can be changed and it adds lo-fi touch to the signals. Also Bucket Variation adds subtle fluctuations on voltage value of delayed signals.

Freeze Buffer function can turn the module into a loop machine. Overdubbing on recorded buffer can be done with Overdub button.

Maximum actual delay time is about 4000ms at the current build with maximum setting of Buffer Size.

Update

Build 23

• Fix: Delay time wasn't properly restored from saved state when the Sync switch is turned on. Now it works.
• Added: View range of the grid can be extended by the Extended View Switch for setting longer delay time. It doubles the range (maximum value of delay time is not changed. just range of display).

Build 20

New Features

• Introduces Variable Buffer Size.
• Bucket Variation is added.
• Freeze Buffer (+ Overdub) is added.

Controls and I/O

Grids

• Grid: You can set delay time with click or drag the mouse on the grid. The grid can be quantized with musical note value. The actual delay time is changed corresponding to change of bpm value as actual delay time is calculated with position of the marker on the grid. In other words, position of the marker is not changed with change of tempo. White colored frame is usable grid range and it'll be shortened at the slower bpm value. In faster bpm settings, you can drag the marker far beyond the right edge of the grid until actual delay time reaches maximum value.

Inputs

• In: Inputs a signal which you want to apply the effect.
• Ext. FB In: If any jack is connected to this External Feedback input, it injects the signal to each line's feedback loop and internal feedback signal is replaced with External signals.
• Time mod. CV In: Modulation CV input for the delay time. When the Time Modulation CV Input Volume is set to 100%, incoming signal of ±5v corresponds to approximately ±500ms delay time. It is not affected with bpm value. The value will be adjusted not to exceed the internal buffer size on both extreme long or short delay time.
• Cutoff CV In: Modulation CV input for the built-in lowpass filter's cutoff frequency. If the Cutoff CV input Volume knob is set to 100%, incoming voltage of ±5v corresponds to ±22,000Hz. e.g.) When you input +5v, actual cutoff frequency is Cutoff Frequency Knob value + 22,000Hz.
• Feedback CV In: Modulation CV input for the individual feedback knob value. When the Feedback CV input Volume knob value is 100%, incoming voltage of ±5v corresponds to ±200% of feedback knob value. If the sum of Feedback knob value and feedback CV value is 0% or minus, it is treated as ±0% and the feedback signal is not added to the delay line.
• Volume CV In: Modulation CV input for the individual output volume knob for each line. When the Volume CV input Volume knob value is 100%, incoming voltage of ±5v corresponds to ±100% of volume knob value. If the sum of Volume knob value and volume CV value is 0% or minus, it is treated as ±0% and the line does not emit any signal.

Outputs

• Mixed Out: Outputs sum of unprocessed dry signal and all enabled lines' signal.
• Delay Out: Outputs sum of all enabled delay lines' signal.
• Individual Out: Outputs each line's effect signal.

Buttons

• Freeze All Buffers: During the button is turned on (lit blue), all delay lines stop both recording and erasing process. Feedback is turned off in this state. Recorded buffer is stored intact and looped infinitely until the freezing is turned off.
• Overdub on Frozen Buffer: During the button is turned on (lit orange), all delay lines overdub the input signal to their buffer. Feedback is not recorded on frozen buffers.
• Grid Quantization on/off Button: Toggles enabled/disabled state of quantization for all grids. Quantization is applied next time you click on the grid. Current position of the marker (consequently, the delay time) is not quantized with this button.
• On/Off Button Those blue buttons on the left side of the grid toggle each line's enabled/disabled state. It simply stops the line and buffered signals in the buckets are not erased. Next time you set the line enabled, you hear the sound remained in the buffer.

Editable label

• bpm: Sets internal tempo value of all delay lines. When the Sync bpm value to host is set on, it turns red and is not editable.

Switches

• Sync bpm value to host: With the switch is on, actual delay time for all lines will be changed at the change of host tempo while the positions of markers on the grid will be intact.
• Extended View: This "+View" switch doubles the view range of the grids when it's turned on.
• Buffer Size Knob Mode: Changes the response of Buffer Size Knob. Default value is 0 (switch is turned down) and in this setting, Buffer Size Knob try to be linear against delay time, but the response of the knob is quite drastic and range of reduction is larger. In the setting of 1 (switch is turned up), response of Buffer Size Knob is slightly gentle and it can be nice for sweeping Buffer Size Knob to get chorus-like effect.
• Lowpass filter switch: Toggles enabled/disabled state of built-in lowpass filter on each line. To suppress aliasing noise occurred from the bucket brigade system, it is recommended to turn the lowpass filter on unless you connect any other lowpass filter module after the output (or before the input) of this module.

Knobs

• Variation: Changes the set of Bucket Variations. Default value is "off" and it has no effect (same sound to previous version of the module). Other values of 1 ~ "7" have different set of buckets and there're some failed buckets which have a little defect in storing the voltage value. Set of 7 has more failed buckets.
• Buffer Size: Changes the amount of buckets for all lines. Lower value means fewer amount of buckets and it causes decimation effect to the delayed signal. Noticeable decimation appears more on longer delay time in the possible range. Maximum delay time is reduced in lower settings. Default value is 100% and it has no effect (same sound to previous version of the module).
• Input Volume: Adjusts the volume of the input signal between 0% ~ 100%.
• Grid Quantization Note Value: Sets quantization unit for all grids. Graphical representation of grids is fixed to 16th notes in spite of any other setting of note value as the 16th grids are better to understand musical delay time intuitively.
• Wet/Dry Balance: Sets the balance of wet and dry signal on mixed signal output. The value 0% is "dry only" and 100% is "wet only."
• Mixed Out Volume: Sets the volume of mixed output jack between 0% ~ 100%.
• Delay Out Volume: Sets the volume of delay only output jack between 0% ~ 100%.
• Delay Time Adjust: On the right side of the grid. It adjusts the position of the marker much narrower range. The value is discrete with 16th note/16 and the actual delay time adjusted with this knob is affected by bpm value.
• External Feedback Input Volume: Sets the volume of external signal between 0% ~ 100%.
• Time Modulation CV Input Volume: Sets the volume of time modulation signals. Default value is 0.2% and with this value you can get gentle vibrato on the line with ±5v LFO module. The range is 0% ~ 100%.
• Cutoff Frequency: Sets base cutoff frequency of built-in lowpass filter.
• Cutoff Modulation CV Input Volume: Sets the volume of cutoff modulation signals between 0% ~ 100%.
• Feedback: Sets the amount of feedback. Ext. FB In signal is also affected by this after the External Feedback Input Volume knob. You should set the amount of feedback carefully when the feedback signal is not filtered with lowpass filter. Unfiltered feedback signals with higher feedback amount can easily make output volume destructively high. The range is 0% ~ 200%.
• Feedback Modulation CV Input Volume: Sets the volume of feedback modulation signals between 0% ~ 100%.
• Volume: Sets the volume of the line individually between 0% ~ 100%.
• Volume Modulation CV Input Volume: Sets the volume of volume modulation signals between 0% ~ 100%.