First of all, we'll create a switch to route the incoming MIDI data either through the Arpeggiator or around it. So let's make a custom user interface to make controlling the Arpeggiator object much more intuitive. Getting the Arpeggiator object working in Logic is quite straightforward, but the interface, as it stands, doesn't encourage experimentation. These include Direction, Resolution and Length. The Arpeggiator object has 10 parameters and a Controller Base to allow you to use continuous controller messages to change these parameters.
Click on the Arpeggiator object and look across to the Environment's Inspector. Notice how the second Monitor object shows the arpeggiated pattern, whereas the first shows the notes of the chord you're holding down. You should hear Logic arpeggiating the notes of that chord and sending that pattern to the record‑enabled ES2 track. Hit play in Logic's transport and hold down a chord on the Caps Lock Keyboard or your MIDI controller.You should now be able to hear Logic arpeggiating the notes of a chord you hold down. Cabling objects together as shown should give you your basic Arpeggiator. Finally, cable the outlet of the second Monitor object into the inlet of the Sequencer Input object.Cable the outlet of the first Monitor object into the Arpeggiator object, then cable the outlet of that into the second Monitor object.Go to the New menu in the Environment window and choose 'Arpeggiator', then access the New menu again and choose 'Monitor'.Remove the cable from the Monitor object to the Sequencer Input and we'll create some new objects to add to our signal flow. Between the two are the Keyboard and Monitor objects. To the right of Clicks and Ports is Logic's Sequencer Input object. On the left‑hand side you will see the Physical Input object, representing the MIDI In ports of your interfaces. The Clicks and Ports layer provides a view of the signal flow of MIDI data into Logic's Sequencer Input and is user-configurable. In the Inspector of the Environment, go to the Environment's Layer menu and choose Clicks and Ports.Now call up the Environment by pressing Command‑8.On the instrument track, call up the ES2 Virtual Analogue Synthesizer and choose the Classic House Organ preset from the Synth Keyboards bank.First, create a new project using 'Add One Software Instrument Track'.As arpeggiators always seem to stay popular in music production, especially for certain dance styles, this month we're going to walk through the creation of an arpeggiator in Logic Pro, complete with a custom user interface that should make it more inspiring and immediate to use during the composition process.
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