PMFoundations ER-808 Bedienungsanleitung

ER-808 – User Guide

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PM Foundations ER-808 v1.4

User Guide

ER-808 – User Guide

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1. Introduction

This is PMF’s tribute to the Roland TR-808, as a Eurorack-compatible module composed of a

panel and a set of build-it-yourself PCBs.

The ER-808 is driven by a PIC microcontroller which is pre-programmed and included with the

PCB set.

2. Touch panel vs Button panel

There are two versions of this project. One uses push buttons to program the steps and the

other introduces capacitive touch pads directly on the front panel to modernize the TR-808

experience.

The touch panel "buttons" are capacitive touch pads consisting of the area surrounding the step

LED and marked with a rounded square outline on the panel.

3. Short press and Long Press

Touching a step pad or pressing a step button toggles that step. Holding the pad or the button

for an extended period results in a "long press" signal being sent for the step, resulting in

specific and different actions. These actions are described further under the individual actions

listed below.

4. Mode button. Pattern mode (LED is off):

Used to modify the currently loaded pattern. The pattern is only held locally until you save it in

one of the memories. You can assign the drums when the sequence is stopped or you can do it

while it is running. Long press a step to set the length of the pattern. When you long press the

step, the LEDs below that step will all flash once and the pattern will loop from that position

rather than from step 16.

5. Drum buttons

Selected drum (LED on) will be toggled on or off that step when a step button is pressed.

6. Setting Pattern Length

Long pressing a step while in Pattern mode sets the Pattern Length from 1 to 16 steps. While

long pressing the step, all the steps below will flash once to indicate the pattern length has been

set. Any drums programmed to the steps above the pattern length will be removed from those

unused steps.

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7. Mode button. Track mode (LED is ON):

Enables selection of step buttons representing saved patterns, e.g. 1,2,2,3 to build a chain of

patterns. The chain keeps on getting built as each step is pressed. The chain floats locally until

saved. You can’t really see what’s in the chain so keep good notes!

The drum buttons are disabled.

8. Start/Stop

Runs the sequence at the set tempo. In Pattern mode it will repeat at the step marked as the

final step. In Track mode it will repeat at the end of the last pattern in the chain.

9. Save

Flashes the Mode LED, press Save again to cancel procedure.

When in Pattern mode: Select a step number representing memory number. The current

pattern will be saved to that memory, overwriting anything that is in that memory location.

When in Track mode: Select a step number representing memory number. The current chain of

patterns (track) will be saved to that memory.

10. Load

Flashes the Mode LED, press Load again to cancel.

When in Pattern mode: Select a step number representing memory number. The saved pattern

will be recalled from that memory. Start/stop/forward/back/clear is disabled until load

complete.

When in Track mode: Select a step number representing memory number. The saved

track/composition will be recalled from that memory. Start/stop/forward/back/clear is disabled

until load complete.

11. Clear button

Flashes the Mode LED, press Clear again to cancel. Press ANY step to confirm clear operation.

When in Pattern mode: Removes all the instruments from all the current steps.

When in Track mode: Removes all the chained patterns from the local track , i.e. undo chaining

and leave 0 patterns in the chain

ER-808 – User Guide

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12. External Start, Internal Clock and External Clock

With the External Clock disconnected, when the ER-808 receives an External Start pulse it

primes the sequencer at step 1 and starts the Internal Clock. When the External Clock is

connected, the Start button or the External Clock signal primes the sequencer at step 1 and the

first clock pulse starts the sequence running.

13. Clock Out

The Clock Out has a 1ms pulse width (1ms high and remainder of step low). The clock level is

+10v approximately.

14. Accent and Trigger

The loudness and length of each beat is dependent on the trigger level at each drum module.

With Accent at 0, the internal trigger level is +4V. With the Accent at full clockwise, the internal

trigger level is +11V. However, for clap, cowbell, cymbal, closed high hat and open high hat the

internal clap levels are lower to reduce an inherent noisier oscillator in these modules. The

reduced trigger levels keep the noise low when these modules are not being triggered.

15. Trigger Out

The Trigger Out level is a 1ms pulse of +10V. The Trigger Out from any step is 0 unless the

Trigger Out "drum" is programmed to that step.

16. Noise reduction

Some of the oscillators used in the ER-808 are inherently noisy. At high volumes you may hear

background noise from the oscillators. To reduce or eliminate noise you can connect the outputs

of the ER-808 to a VCA and use the Trigger Out pulse applied to each step to open the VCA

either directly or through an external Envelope Generator. This patch creates a noise-gate for

the ER-808 which keeps it silent except when a drum sound is programmed on a step.

17. Factory patterns

The following pre-set patterns can be loaded into the pattern and track memories:

Pattern:

//0 rock a (pattern 1)

ER-808 – User Guide

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//1 rock b

//2 bossa nova a

//3 bossa nova b

//4 mambo a

//5 mambo b

//6 samba a

//7 samba b

//8 bm 1 a

//9 bm 1 b

//10bm 2 a

//11bm 2 b

//12bm break

//13bm main (pattern 14)

bm is basic Blue Monday drum parts .

In Track Mode there is a preloaded Blue Monday drum track at track 16.

To load the pre-set patterns and tracks, press and hold the LOAD button for a few seconds until

all the steps flash. They are now loaded into the memory. All 14 patterns and the track are

loaded at the same time and can then be accessed individually using the standard load

procedure i.e. Load Button followed by pattern number (using step buttons 1-13) or Track

number (using step button 16)

18. Factory reset

To clear everything and do a factory reset, press and hold the CLEAR button. This removes any

user or pre-set patterns/tracks from the memories. Preset patterns/tracks can be recovered

again using the load sequence described above.

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