mobilesynth (App Store link) is an open source classic monophonic synthesizer for the iPhone, designed for live performance.

Developers are encouraged to visit the project website and contribute.

If you’ve used mobilesynth, leave a comment with your thoughts!

Features:

• Monophonic, playing one note at a time like a class synthesizer
• Oscillator Module
  • Dual oscillators
  • Square, Triangle, Sawtooth, Reverse Sawtooth waves
  • Octave selector, supporting 5 octaves
  • Glide between notes (Lag Processor)
  • Oscillator fine tune (more than one full octave)
  • Oscillator sync
• Low Pass Filter Module
• Modulation module
• Tremelo/Wave
• Vibrato/Pitch
• Filter
• Envelope Generator module
• Supports ADSR (Attack, Decay, Sustain, Release)
• Volume
• Filter (amount of low pass filter)

The Yamaha CS-05 is a single oscillator monophonic synthesizer, released in 1979, that has been described as “an unremarkable synth”:

It was a one oscillator job with a single ADSR envelope that controlled both the filter and the final amplifier. A simple LFO was provided for modulation and it also had a noise generator for sound effects.

Its saving grace was the multi-mode filter that offered low, band and high pass options which was unusual on a budget synth of the time.

Features:

• 1 VCO with pulse or sawtooth waveforms and noise-gen
• LFO with sine, sawtooth, sample and hold
• 12dB/oct High pass or Low pass; 6dB/oct band-pass

Resources:

• Yamaha CS-05 user manual
• Yamaha CS-05 at Fantasy Jack Palance
• Vintage Synth entry

Overview:

The Oxford Synthesiser Company (OSC) OSCar is a vintage mono-synthesizer, first released in 1983.

It features two digitally controlled oscillators and twin 12dB filters, which can be configured as lowpass, highpass and bandpass filters. It also featured some early digital capabilities, like patch memory and a basic sequencer.

An unusual feature of the Oscar was it’s additive synthesis capabilities. New waveforms could be created by changing the amplitudes of up to 24 harmonics, achieved by inputting values on the actual keyboard. This considerably widened the Oscar’s sound palette.

According to EM’s Julian Colbeck, “The Oscar’s strength is its ability to deliver idiosyncratic lead, bass, and obbligato sounds with tremendous power and flexibility. You can create custom waveshapes, set up and externally clock sequences and arpeggio patterns, and store your tweaks into its programmable memory. Although the Oscar is lumped in with the Minimoog and friends as one of the great classic analogs, only its filters are truly analog; everything else about the Oscar is digital.”

The OSCar was $1,000 new; now they sell for $2,000 and up.

Specifications:

• Two digitally controlled oscillators (DCOs)
• Twin 12dB/oct analog filters, which can be configured as a 24dB/oct filter, lowpass, bandpass or highpass filters.
• Two ADSR Envelopes
• 12 user, 24 preset patch memory. Later MIDI-equipped models offered 36 programmable patches.
• Custom Waveforms: 24 waves.
• 24 sequence memory

Resources:

• OSCar retrospective at EM
• There’s a great article on the OSCar at Sound On Sound
• OSCar at Vintage Synth
• GMedia Music makes a virtual version of the OSCar, the impOSCar