Downward Long – Controls the target filter settings for the Downward Long Interval as defined by the ‘Downward Tuning Reference’ value.

The PRF/DEF filters were designed specifically to address and emulate the characteristics of samples whose pitch and dynamics have been transposed. For this reason, this musically adapted filter does not behave like a traditional EQ, with one parameter effecting the next. Experimentation is encouraged. It might also be helpful to use a Frequency Analysis Plug-in at first to get a feel for each filter parameter.

Fc – Determines the initial center frequency for the Q0 Quality factor.

Q0 – Simultaneously determines gain, Quality (filter width) and a center frequency offset relative to the initial Fc setting.

Q0H – This high frequency quality factor has a fixed center frequency near 7.5 khz and is especially helpful in de-emphasizing the harsh overtones of upwardly transposed samples.

V0 – Initially designed to compensate for any gain attenuation imposed by the filter, V0 can also be used creatively to increase the dynamic range of an instrument, achieving softer pianissimos and bolder fortes.

Designing Filter Profiles

When designing filter profiles, it is best to set ALL four filter parameters (Fc, Q0, Q0H, V0) for a single interval set before moving on to the next interval set, i.e. once you select ‘Up Long’ you should finish tweaking Fc, Q0, Q0H, and V0 before selecting the ‘Up Short’ interval.

For example, to adjust the ‘Up Short’ filter set parameters, first select the ‘Up Short’ interval set.

Now trigger a note and bend that note upward by three semitones to hear what the current filter settings sound like. Next, adjust Fc, Q0, Q0H and V0 until the transposed note sounds as close as possible to the non-transposed note. The goal is to adjust the ‘Up Short’ filter parameters until, for example, a note transposed from C3 to D#3 sounds the same as a non-transposed triggered at D#3.

Note: Once a parameter has been modified, it is necessary to first hit ‘Apply’, then retrigger the note before the new settings will be audible.

Before Adjusting the ‘Up Long’ and ‘Down Long’ filter sets, make sure that you specify the Upward and Downward Tuning References on the main ‘Portamento Reshaping Filter’ Tab. The ‘Long’ filter sets correspond directly to the number of semitones specified by these tuning references. For instance, if you set the upward tuning reference to 12 semitones, the exact ‘Up Long’ filter settings will be applied to samples that have been transposed upward by 12 semitones. Samples transposed upward to less than 12 semitones (between 4 and 11 semitones) will be filtered by a composite of the ‘Up Short’ and ‘Up Long’ filter set parameters (morphed).

Please see Chapter 9 on editing parameters in the Region Window for more specific details on adjusting region specific values.

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4 specifications

The Tascam 4, also known as the Tascam Portacapture X8, is an advanced portable audio recorder that brings a range of professional features, technologies, and characteristics designed for musicians, filmmakers, and content creators. This versatile device is equipped to capture high-quality audio in various settings, whether for music production, field recording, or podcasting.

One of the standout features of the Tascam 4 is its dual XY and AB microphone configuration. This allows users to choose between different stereo recording techniques, providing flexibility and creativity in sound capture. The XY arrangement is perfect for capturing live performances or ambient sounds, while the AB configuration is great for recording wider soundscapes. Additionally, the built-in microphones are of high quality, ensuring that recordings maintain clarity and fidelity.

The Tascam 4 offers up to eight tracks of simultaneous recording, giving users the ability to capture multiple audio sources at the same time. This is particularly useful for music recording sessions, where different instruments and vocals can be isolated on separate tracks. It supports various file formats, including WAV and MP3, with sample rates up to 24-bit/192kHz, ensuring professional-level audio quality.

For more advanced users, the Tascam 4 includes features such as multi-track overdubbing and built-in effects like reverb, which allow for creative sound manipulation. The user-friendly touchscreen interface makes navigating through settings and functions straightforward, while the customizable faders and buttons give users quick access to frequently used controls.

Another significant technological aspect of the Tascam 4 is its USB audio interface capability. This feature lets users connect the device to a computer, making it an effective solution for home studios. It can be used for live streaming or as a high-quality microphone input for podcasts and other applications.

Furthermore, the Tascam 4 is designed with durability and portability in mind. Its compact form factor and robust build make it easy to carry on location, while its battery life ensures long recording sessions without frequent recharging. Whether you're a seasoned audio professional or an aspiring creator, the Tascam 4 provides an impressive array of tools and features that make it a reliable choice for high-quality audio recording in any situation.
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