Setting the Auto Loop parameter requires some thought as it specifies how the Auto Sampler will approach automatically looping the sample and should be set according to the type of patch you are sampling. As we are sampling a single periodic waveform we can drop the Sustain parameter down from 10 seconds to a lower value, I used a value of 6 seconds but it could easily be lower. Set the Sample Every parameter to three semitones this will give you a relatively high frequency of sampling but each octave will maintain a similar sample transposition factor. Set the note range parameters Range Start and Range End to encapsulate the lowest and highest note you will ever want to play, I generally set this from C0 to C7 (see Screen 1, above). Now that our synth sound is ready for sampling, let’s look at the basic parameters of the Auto Sampler. If not, turn all the other oscillators off or down, then set all the LFO and envelope modulation to be equivalent to zero (or off) and, lastly, bypass any effects. If the synth has an equivalent of an ‘init’ or ‘default’ patch with all the modulation and effects turned off then load that. Set up the synth so that you have the sound of a single, raw oscillator. I’m using my Moog Sub37, however you can use any synth from which you like the raw character of the oscillators. Let’s begin sampling with a single oscillator from an analogue synth. To avoid the risk of distortion, I always aim to leave at least 6dB of headroom. Play a selection of notes from the full range of the keyboard and check that no note drives the input into distortion. As you play notes from the keyboard you should be able to monitor the output of the synth coming into the Auto Sampler. The Auto Sampler UI is divided into sections - click on the keyboard to check that your synth is set up correctly and receiving MIDI. To fix this, go to the Input field of the channel strip and set it again in there.) Next, add the Auto Sampler by clicking on the first insert slot in your new external instrument channel strip, then go to Utility / Auto Sampler. (I found a bug present where the audio input I set in the pop‑up didn’t set the audio input on the channel strip. Then configure the audio and MIDI port options to reflect the connections to your synth. Click on the plus button at the top‑right of the Channel Strip Mixer UI to bring up the new Channel Strip pop‑up, and set the Type to External Instrument. Now your connections are all set up, let’s add a channel strip to carry out the auto‑sampling. Lastly, go to MainStage 3 / Preferences / Audio and set the Audio Output and Audio Input fields to the audio interface your synth is plugged into. If MainStage loads the template in full screen mode simply click the X in the top left‑hand corner to exit Perform mode and enter Edit mode. Open MainStage, go to File / New and from the Concert selection pop‑up go to the Keyboards tab, then select the Keyboard option and click the Choose button. You will also need to connect the audio output of your synthesizer to the audio input of your audio interface. To begin, you will need to connect the MIDI out of your computer to your synth’s MIDI in so that MainStage can send your MIDI Notes to trigger voices to sample. If you don’t already own MainStage, it’s a bargain at £28.99 $29.99 - even if you just used the Auto Sampler and none of its other features, it still represents excellent value for money when compared to buying other equivalent auto‑sampling packages. In this month’s Logic workshop we look at how to auto‑sample hardware synthesizers to create EXS24 patches which can then be used in Logic. However, it wasn’t until 2015, with the release of MainStage 3.1, that we saw Apple put that technology into one of their products. In 2012 Apple acquired the Italian company Redmatica and their Auto Sampler, Keymap Pro and EXS Manager software titles. If you own one of the many analogue monosynths from companies like Moog, Korg or Behringer and have dreamt of having a polyphonic version of that synth then auto‑sampling could be a great way to explore some of those possibilities. Turn hardware monosynths into software polysynths by auto‑sampling in Logic’s companion app, MainStage. Here it’s configured to sample every three semitones and the Auto Loop parameter is set to ‘Search’ so it automatically finds the best loop points. Screen 1: The Auto Sampler’s plug‑in GUI allows you a lot of control over the auto‑sampling process.
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