Exploring the Dual Oscillator Model 258t: A Comprehensive Guide to Tiptop Audio's Buchla Module

Tiptop Audio's Buchla Module Model 258t is a dual oscillator module that offers an extensive range of features and functionality for eurorack enthusiasts. The module includes two independent voltage-controlled oscillators, each with a processing input, frequency modulation input, and 1V/oct input. Additionally, the waveshapes, as well as the frequency, can be voltage controlled, providing more creative sound options.

One of the key features of the Model 258t is the low sine wave harmonic content, which makes it ideal for creating pure and stable signals. The module also boasts high short and long-term stability, even with rapidly changing ambient temperatures, making it a reliable option for live performance and studio recording.

The module includes three trimmers for each oscillator on the back of the module. The 1V/oct trimmer is set at the factory using high-precision instruments and ensures accurate tracking across the entire frequency range. The shape trimmer sets the sine wave, allowing the user to adjust the harmonic content of the signal. The VC wave shape trimmer sets the response of the waveshaper to the incoming control voltage and is used to adjust the sine wave purity further.

In summary, the Tiptop Audio Buchla Module Model 258t provides a comprehensive guide to dual oscillator modules. It offers a wide range of features and functionality, including low sine wave harmonic content, stability, and trimmers for fine-tuning the signal. As a result, it's an excellent addition to any eurorack setup and provides a reliable and creative tool for generating complex soundscapes.

Example Usage

A great way to explore the Dual Oscillator Model 258t is by using it to create a classic synth sound: the lead. Start by patching one oscillator into a low-pass filter and a VCA, and the other oscillator into a high-pass filter and a second VCA. Use the frequency modulation input to add some movement and interest to the sound. Finally, use the 1V/oct inputs to play a melody and experiment with the waveshapes to find the perfect lead sound. Don't forget to tweak the trimmers on the back of the module to fine-tune your sound!

In this example, we will use the Dual Oscillator Model 258t to create interesting and evolving FM sounds. First, we will patch the output of the second oscillator into the frequency modulation input of the first oscillator. We will then set the 1V/oct input of the second oscillator to a slow LFO. Finally, we will adjust the SHAPE and VC WAVE SHAPE trimmers of the first oscillator to shape the sine wave and control the response of the waveshaper to the incoming control voltage. With these settings, the first oscillator will be modulated by the second oscillator, creating complex and evolving FM sounds. We can further shape the sound by using the processing input of both oscillators and adjusting the frequency of the first oscillator. This is just one example of the many possibilities that the Dual Oscillator Model 258t offers.

Further Thoughts

For a mind-bending modulation experience, try using the Buchla Dual Oscillator Model 258t's frequency modulation input with an audio-rate signal from another oscillator. Adjust the VC WAVE SHAPE trimmer to taste for a wide range of FM sounds, from subtle vibrato to wild metallic tones. Experiment with the SHAPE trimmer to adjust the harmonic content of the sine wave and achieve unique timbres. The 258t's excellent short and long-term stability ensures that your FM sounds will stay precise and in tune, no matter how rapidly the environmental temperature changes.