Mopho (addendum OS 1.4) - Electronic musical instrument Sequential - Free user manual and instructions

Product Type	Electronic musical instrument – Analog synthesizer module
Brand	Sequential (formerly Dave Smith Instruments)
Model	Mopho (OS 1.4 addendum)
Operating System	Version 1.4
Dimensions (W x D x H)	8.5 x 5.5 x 1.75 inches (approx.)
Weight	1.4 lbs (approx.)
Power Supply	9V DC adapter, center positive (100-240V AC input)
Arpeggiator Modes	Up, Down, Up Down, Assign, Random, and 2/3 Octave variants (15 total)
Sequencer	4 sequences with per-step Slew control for smooth transitions
Audio/Modulation Destinations	Oscillator frequency, filter cutoff, and other assignable parameters
Tap Tempo	Hold Assign Parameters and tap Push It to set tempo on the fifth tap
Quick Edit	Assignable Parameters knobs with Program knob for fast value changes
MIDI Implementation	Program and bank change messages can be enabled/disabled via M Program Ch
Pedal Mode	Norm (standard sustain) or Arp (latch arpeggiated notes with sustain pedal)
Maintenance	Clean with a soft, dry cloth; avoid liquids and moisture
Safety	Use only the recommended power adapter to avoid damage
Spare Parts & Repairability	No user-serviceable parts inside; contact qualified service for repairs
Documentation	Manual addendum for OS 1.4, free download from Sequential

Frequently Asked Questions - Mopho (addendum OS 1.4) Sequential

What is the Mopho OS 1.4 addendum about?

The addendum documents additions and changes to the Mopho operating system not covered in the original manual. It includes new arpeggiator modes, a sequence Slew parameter, Tap Tempo, Quick Edit, and MIDI behavior options.

How do I set the pedal mode to Arp?

In the Global Parameters section, set Pedal Mode to 'Arp'. When the arpeggiator is on, MIDI sustain pedal messages (CC#64) will latch the arpeggiated notes. When the arpeggiator is off, the pedal behaves normally.

What are the new arpeggiator modes added in OS 1.4?

OS 1.4 adds ten new modes including 2 Octaves and 3 Octaves variants of Up, Down, Up Down, Assign, and Random. These play the keyed notes plus the same notes one or two octaves higher in various orders.

How does the Slew parameter work in the sequencer?

Slew (located in sequences 2 and 4) sets the slew rate between the previous step's value and the current step's value when the step is gated on. Higher Slew values create slower transitions, producing a glide or portamento effect.

Can the Slew parameter affect any modulation destination?

Yes, Slew affects the sequence above it. For example, if sequence one is routed to oscillator frequency and sequence two is set to Seq1 Slew, it will create a smooth glide in pitch. Slew can similarly be applied to filter cutoff or any other sequence destination.

How to use Tap Tempo to set the tempo?

Hold down Assign Parameters and tap Push It repeatedly. On the fifth tap, the tempo changes and is displayed on the LCD. This allows quick tempo setting without menus.

What does Quick Edit do?

With Assign Parameters on, you can choose a parameter to edit using any of the four Assignable Parameters knobs, then change its value with the Program knob. This speeds up editing during performances.

How do I enable the Mopho to respond to MIDI program changes?

In Global Parameters, set M Program Ch to 'On'. When on, the Mopho responds to MIDI program and bank change messages. When off, these messages are ignored but other MIDI data is still received.

Does the sustain pedal latch arpeggiated notes?

Yes, if Pedal Mode is set to 'Arp' and the arpeggiator is on, holding the sustain pedal will latch the arpeggiated notes, allowing them to continue after releasing the keys. With the arpeggiator off, it behaves as a standard sustain pedal.

Why does a high Slew value cause steps to sound flat or sharp?

Depending on BPM and Clock Divide settings, a high Slew value can make the slew rate exceed the gated time of an envelope. This means a step's value may not be reached, causing pitch to sound slightly off. Reduce the Slew value to correct this.

USER MANUAL Mopho (addendum OS 1.4) Sequential

Mopho Manual Addendum

The latest version of the Mopho operating system makes some additions and changes that are not documented in the manual.

Global Parameters

Pedal Mode: Norm, Arp – When set to Arp, MIDI sustain pedal on messages (CC# 64) will latch the arpeggiated notes when the arpeggiator is on. When the arpeggiator is off, sustain pedal messages have the normal, expected effect.

M Program Ch: On, Off – When on, Mopho responds to MIDI program and bank change messages. When off, Mopho ignores program and bank change messages, but continues to receive other MIDI messages.

Program Parameters

Arpeggiator Mode: see table – Several new arpeggiator modes have been added. See the table below for details.

Arpeggiator Mode	Behavior
Up	Plays from lowest to highest note.
Down	Plays from highest to lowest note.
Up Down	Plays from lowest to highest and back to lowest.
Assign	Plays notes in the order keys were pressed.
Random	Randomly plays notes.
2 Octaves Up	Plays keyed notes and the same notes one octave higher, from lowest to highest.
2 Octaves Down	Plays keyed notes and the same notes one octave higher, from highest to lowest.
2 Octaves Up Down	Plays keyed notes and the same notes one octave higher, from lowest to highest and back to lowest.
2 Octaves Assign	Plays a keyed note, then the same note one octave higher, in the order keys were pressed.
2 Octaves Random	Randomly plays keyed notes and the same notes one octave higher.
3 Octaves Up	Plays keyed notes and the same notes one and two octaves higher, from lowest to highest.
3 Octaves Down	Plays keyed notes and the same notes one and two octaves higher, from highest to lowest.
3 Octaves Up Down	Plays keyed notes and the same notes one and two octaves higher, from lowest to highest and back to lowest.
3 Octaves Assign	Plays a keyed note, then the same note one and two octaves higher, in the order keys were pressed.
3 Octaves Random	Randomly plays keyed notes and the same notes one and two octaves higher.

Sequence 2 Destination: Seq1 Slew Sequence 4 Destination: Seq3 Slew – In modular analog synthesizers, a lag processor or slew limiter is used to create a time-varying change—a smooth transition—between successive, discrete control voltage levels. The rate of change is called the slew rate and one common application is to create a glide (aka portamento) effect between notes.

Among the possible destinations for Mopho sequences two and four is a sequence-only parameter called Slew. Slew behaves a little differently from the other modulation destinations, in that it is not really a destination at all; instead, it affects the sequence above it. That is, if Seq1 Slew is the chosen destination for sequence two, it controls sequence one, and Seq3 Slew in sequence four controls sequence three.

In Mopho's sequencer, Slew sets the slew rate between the previous step's value and the current step's value when the step is gated on. Confused yet? This should help: let's say sequence one is routed to oscillator frequency and sequence two to Seq1 Slew. Increasing the Slew value for step four will cause the oscillator frequency to glide from the step three value when step four is gated on. The higher the Slew value, the slower the slew rate. And

the slew rate can be different for each step. But its not just for oscillator glide. Slew can be applied to any of the destinations. For example, sequence three could be routed to filter cutoff with Slew in sequence four used to create a less abrupt transition from one step to the next.

Note: Depending upon the BPM and Clock Divide settings, the slew rate can actually exceed the time the envelopes are gated on, causing a step in the affected sequence to not reach its set value. For example, if Slew is applied to oscillator frequency, high Slew values may cause a step to sound flat or sharp. If that's not what you want, simply reduce the Slew value.

Other New Features

Tap Tempo - Hold down Assign Parameters and tap Push It to set the tempo. On the fifth tap, the tempo changes and is displayed on the LCD.

Quick Edit – When Assign Parameters is on, choose a parameter to edit with any of the four Assignable Parameters knobs, and change the value using the Program knob.