Check the listing for details. Source Audio SA 248 - One Series Spectrum Intelligent Filter. Condition: New. Listed at 316.44 USD. The Source Audio SA 248 Spectrum Intelligent Filter is probably the most flexible and powerful stereo filter effects pedal ever developed. Not only does the pedal feature envelope filter effects inspired by the most well-known and sought-after effects pedals on the market, but it also offers the ability to create octave tones and distortion. This makes Spectrum a cleverly integrated all-in-one jam and funk machine. For easy plug-and-play use, the pedal comes with six selectable presets, which can be selected using the toggle switch. The 128 factory presets can also be selected via a MIDI controller. In combination with the free Neuro Desktop Editor or the also free Neuro Mobile App you can only see the actual potential of the pedal. The software gives you access to an editor that offers.