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In many ways, this is good because you have access to all parameters and sounds with one or two clicks of your mouse. Surprisingly, all of this power is housed within a single-window interface. Although, polyphony isn't really limited because you can just open multiple instances. The only limitations are CPU power and a polyphony limit of 256 notes per SampleTank module. This means that you can effectively create a song with sixteen different sounds all playing at once from one instance of the SampleTank plug-in. Its architecture provides sixteen parts, each of which can be assigned its own individual Instrument (patch or sound), MIDI channel, polyphony limit, panning, volume, and stereo output. SampleTank is a software sampler, synthesizer, and effects processor all built into a single virtual instrument. After a bit of searching, I found a product that provided everything needed for this type of situation: SampleTank 2.5 XL from IK Multimedia. Other synths, like Native Instruments KONTAKT, provide plenty of power but lack the interface simplicity for quick and easy access to parameters. Some synths, like the Cakewalk TTS-1, are okay for simple arrangements but usually don't provide enough power.
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This is especially true if I'm away from the studio and working with a laptop.
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I like to sketch things out using just one software synth that provides support for multiple sounds playing on multiple MIDI channels through multiple audio outputs. When composing a song using all virtual instruments, I try to keep things simple at first.
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