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The SE-50 is a multi effects unit. It was released 1990 and was in production until the SE-70 was released 1993. The unit is equippped with a 16 bit DA/AD converter and uses a sampling frequency of 32kHz or 48kHz depending upon the chosen effect. The SE-50 has both stereo in and out, is fully MIDI compatible and its 100 user presets can be stored externally using the MIDI interface.

The SE-50 has 28 built-in algorithms. An algorithm is a predefined combination of effects. Several of the 28 algorithms are single effect algorithms so thought it may sound like the SE-50 can combine effects in many ways, this isn’t absolutely true. Guitar players may be interested to know that the only algorithm capable of producing distortion is Guitar Multi and the only settings for the overdrive/distortion is level/drive and turbo on/off. The unit is very much focused on reverb where 9 of the 28 algorithms are reverb only algorithms.

Boss SE-50 Stereo Effects Processor

There are 128 presets. Preset 101-128 cannot be overwritten as they demonstrate each of the 28 algorithms. Preset 1-100 are user programmable and by copying one of the 28 fixed presets into one of these locations a start position with the chosen algorithm is easily achieved.

The 28 algorithms:

1Hall 1Natural hall reverberation
2Hall 2Hall reverberation with mid boost
3RoomRoom reverberation
4PlateSimulation of a metal plate vibrating to produce reverb
5AmbienceAmbience microphone reverb
6Gate ReverbThe reverb is muted partway through
7Stereo ReverbTwo channel reverb with common settings for both channels
8Multi Delay5 delays in a row
9Multi Tap Delay5 delays in a row with different settings than Multi Delay
10Stereo DelayDelay with independent settings for each channel
11Space ChorusA slightly pitch shifted signal is added to the original signal
12Multi Pitch Shifter4 parallel pitch shifters adjustable to +/- 2 octaves
13Stereo Pitch ShifterIndependant pitch shifting on each channel adjustable to +/- 1 octave
14Stereo FlangerA flanger and gate effect connected in series
15Stereo PhaserA phase shifted signal is added to the original signal
16VocoderRequires a microphone to R input and keyboard to L input. Has a chorus and noise supressor connected in series from the vocoder’s output.
17RotarySimulates a rotary Speaker. Has a noise supressor in series with the rotary’s output
18Keyboard Multi 1A stereo series consisting of: Equalizer – Delay – Chorus – Reverb
19Keyboard Multi 2A stereo series made up of: Phaser – Equalizer – Chorus – Reverb
20RhodesSimulates Fender Rhodes electric piano sound using a stereo series of: Equalizer – Phaser – Noise Suppressor – Chorus – Panning – Reverb
21Guitar MultiA stereo series consisting of: Compressor – Overdrive/Distortion – Equalizer – Noise Suppressor – Delay – Chorus – Reverb – Line Driver
22Vocal MultiA stereo series made up of: Limiter – Enhancer – Noise Suppressor – Delay – Chorus – Reverb
23Stereo EnhancerA stereo series made up of: Limiter – Enhancer – Noise Suppressor – Delay – Chorus – Reverb
242 Channel MixerThis algorithm consists of Equalizer, Noise Suppressor, Delay, Chorus and Reverb. The 2 first effects are applied separately to each channels while the latter 3 can be panned right and left
25Reverb1 + Reverb2Separete reverb for each stereo channel
26Gate Reverb + ReverbGate Reverb on left channel, conventional reverb on right
27Chorus + ReverbChorus on left channel, reverb on right
28Delay + reverbDelay on left channel, reverb on right