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Controls and Jacks: PI Expander

Env. Level Knob

The

Env. Level

knob attenuates the signal of the

Env Out

jack on the

PI Expander

When the knob is turned all the way down, the jack will output 0V (no signal). As the

knob is turned up, the signal will increase in amplitude to a maximum of 9V.

Inv. Level Knob

The

Inv. Level

knob attenuates the inverted envelope signal of the

Inv. Out

jack.

When the knob is turned all the way down, the jack will output 0V (no signal). As the

knob is turned up, the signal will increase in amplitude to a maximum of 9V. For

example, if the knob is at 50%, the

Inv. Out

jack will output a steady 4.5V until an

envelope is triggered, at which point it will fall to 0V and then decay back to 4.5V.

Env. Out Jack

The

Env. Out

jack on the

PI Expander

outputs an attenuated envelope signal. This

jack functions like the +

Env. Out

jack located on the main

Percussion Interface

module, except that it can be attenuated with the

Env. Level

knob

Inv. Out Jack

The

Inv. Out

jack outputs an attenuated inverted envelope signal. This jack functions

like the -

Env. Out

jack

located on the

Percussion Interface

module, except that it

can be attenuated with the

Inv. Level

knob

Audio Out Jack

The

Audio Out

jack outputs an amplified version of the input signal. It can be used

as a pre-amp for microphones or other low-level signals to boost them to modular

level. The gain/boost amount is determined by the position of the

Sensitivity Knob

on the

Percussion Interface

and the

L|M|H

switch on the

PI Expander.

L|M|H Switch

The

L|M|H

Switch selects the gain range of the input signal. The

setting

corresponds to

low gain,

the

medium gain,

and the

setting to

high gain.

See

Setting Input Gain section on page 6 for more information.

1/4" Input Jack (6.35mm)

The

1/4” Input

jack allows for the use of a mono 1/4’’ (6.35mm) instrument cable.

The

1/4” Input

jack can only be used when the

jack on the main

module is

unpatched; patching into the main

jack will disable the

1/4” Input

jack. This jack is

mono (TS), so only the left channel of a stereo TRS cable, or the + signal of a

balanced cable, will be used.

Page of

Input

Env. Level

Inv. Level

Env. Out

Inv. Out

Audio Out

Содержание Percussion Interface (PI)

Страница 1: ... gain stage options a modular level audio output jack a 1 4 6 35mm input jack and envelope attenuation capabilities The PI Expander connects to the PI with an included ribbon cable and does not require a separate power header The two modules are only available together as a pair Percussion Interface and PI Expander features Sensitivity knob Low Medium High gain switch and clipping LED Sustain cont...

Страница 2: ...cks PI Expander 5 Setting Input Gain 6 Using the PI with Various Sources 7 Envelopes in Gen Mode 8 Envelopes in Follow Mode 9 Velocity Sensing 10 Preventing Misfires and Undesired Gates 12 Calibrating Lockout Time for Gate Out 13 Sidechaining with the PI 14 Electrical and Mechanical Specifications 15 My Patch Notes 16 Page of 2 16 ...

Страница 3: ...oriented towards the bottom of the module 3 On the back of the PI Expander you will see one 8 pin header Using the provided 8 pin ribbon cable plug one end of the cable to the PI Expander and the other end to the 8 pin header on the back of the Percussion Interface The red stripe on the cable should be orientated towards the bottom of both modules 4 Using the included screws securely attach the Pe...

Страница 4: ...um pulse width is 5ms and the maximum is 0 5s Envelope Decay Knob The Env Decay knob sets the decay time of the envelope The envelope has an exponential curve Follow Gen Switch The Follow Gen switch selects between two envelope modes In Gen mode the envelope has a sharp attack followed by a sustain period and an exponential decay The attack and sustain period are synchronized with the gate output ...

Страница 5: ...utputs an attenuated inverted envelope signal This jack functions like the Env Out jack located on the Percussion Interface module except that it can be attenuated with the Inv Level knob Audio Out Jack The Audio Out jack outputs an amplified version of the input signal It can be used as a pre amp for microphones or other low level signals to boost them to modular level The gain boost amount is de...

Страница 6: ...ithout the PI Expander the gain range can be set using a jumper on the back of the Percussion Interface Note that if the jumper is missing completely the default setting will be MEDIUM GAIN Page of 6 16 L M H switch position Range Use Cases L Low Gain 0 2x gain Best for modular level and some professional line level signals M Medium Gain 0 20x gain Best for instrument line and some low impedance m...

Страница 7: ...as possible The HIGH GAIN setting on the PI is typically the best setting for high impedance microphones Low Impedance Microphones Low impedance microphones such as professional vocal or drum microphones typically require setting your PI to MEDIUM GAIN In some situations LOW GAIN and HIGH GAIN settings will perform better so experiment to find the best setting Acoustic drums will often have a long...

Страница 8: ...ger the PI In Gen mode it s easy to adjust Sensitivity until unwanted envelopes and gates are no longer generated Another use case for Gen mode is to trigger a PI with one part of a drum say the snare head but not with another part of the drum say the rim By setting the L M H switch and Sensitivity knob appropriately and placing the microphone in a location where it picks up the head louder than t...

Страница 9: ...w mode the Decay knob controls how quickly the envelope decays when the input amplitude falls The envelope attack is always very rapid Figure 5 illustrates the envelope shape when Decay is set fully counterclockwise You ll notice the envelope begins to resemble the input source more closely This can be used as an audio output as a frequency modulation source or in other creative ways In Follow mod...

Страница 10: ...in to respond to the dynamic range of a normal playing style A basic procedure for finding a good velocity sensitivity range is as follows 1 Flip the switch to Follow 2 Turn Sensitivity all the way up 3 While hitting the drum with maximum velocity turn Sensitivity down until the gate no longer triggers 4 Nudge Sensitivity up until the PI gate begins to fire again At this setting the Env Out and In...

Страница 11: ...result in very little signal when the object is struct Attaching it more firmly or to a more firm section of the object can help in this situation Using a standard drum mic attached to a drum is a good way of introducing dynamics to your setup Drum mics are durable and typically easy to attach Clipping a microphone to the rim of a drum will enable you to use the rim as a trigger source more accura...

Страница 12: ...second misfire we need to adjust the Sensitivity or Sustain Adjusting Sensitivity In Figure 12 we ve turned the Sensitivity knob down until only one pulse is generated This technique works best when using samplers drum machines or any source with repetitive sounds and consistent amplitudes Adjusting Sustain With input sources of variable or inconsistent amplitude such as an acoustic drum or a live...

Страница 13: ...e the lock out period and prevent undesired gates This is similar to adjusting the Sustain knob in order to clean up drums with a long decay but the trim pot doesn t change the pulse width of the Gate output Setting the lock out period with the trim pot is useful in Gen mode as it enables you to adjust the Sustain pot freely to control the envelope shape without worrying about undesired triggers T...

Страница 14: ...fires 6 Listen to the audio being ducked as you adjust Inv Level and Env Decay to set the amount of effect and recovery speed When triggered the Inv Out signal will jump low causing the VCA to drop the volume of the audio As the inverted envelope decays it rises back to its resting voltage and the audio source increases in volume The Inv Level knob controls the amount of decrease in the audio sign...

Страница 15: ... 54dB 500x Clip light turns blue when signal post gain exceeds 2 5Vpp Gate is triggered when signal post gain exceeds 6 3Vpp Clip light flashes red when signal clips on Audio Out jack exceeds 10 8V Gate Out jack 1k output impedance 8V gate trigger signal 6ms 0 5s pulse width Env Out jack jack on PI main module 1k output impedance 9V peak sustain 60mV resting off 15ms attack time 70ms 6s exponentia...

Страница 16: ...My Patch Notes Page of 16 16 Env Level Inv Level Env Out Inv Out Audio Out Input PI EXPANDER PERCUSSION INTERFACE IN Sensitivity Sustain Env Decay Follow Gen Gate Env Out ...

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