Some notes for working on and with the Tascam 414 Portastudio 4 Track Recorder deck.

The gap between Erase and Write is 0:00:245 in length at normal speed, 0:00:301 at slow speed.

Generic 5 Second Cassette Loop

This is a generic clear tape loop from WarbleLoopLab. The tape has a particular constant warble, to the point a clear sine tone cannot be read out enough to get an exact key difference. The BPM difference is also impacted by the extreme warble, where it will skip ahead or completely stop on occasion.

Tape Speed In Tape Speed Out BPM In BPM Out Key In Key Out Duration
Normal 🕛 Fast 🕔 120 163.30 C3 ~F#3 0:03:532
Normal 🕛 Normal 🕛 120 118.02 C3 ~C3 0:04:709
Normal 🕛 Slow 🕖 120 95.41 C3 ~G#2 0:06:024

Below are the iZotope RX views of the loop and the Melodyne view of the loop, to see how unstable it is:

iZotope RX View

Melodyne View

Yellow Cassette Loop

Generic clear yellow Cassette Loop from MoonbeanMusic.

Tape Speed In Tape Speed Out BPM In BPM Out Duration
Normal 🕛 Fast 🕔 120 0:03:527
Normal 🕛 Normal 🕛 120 0:04:158
Normal 🕛 Slow 🕖 120 0:05:025

Sony HF 60 High Bias Type 1

An old tape I used in high school Spanish class, not a tape loop but stable enough to get a key.

Sorted by Tape Speed Out:

Tape Speed In Tape Speed Out BPM In BPM Out Key In Key Out Multiplier
Slow 🕛 Slow 🕛 120 85.63 C3 F#2, +15ct 70.9416%
Normal 🕛 Slow 🕛 120 99.52 C3 A2, -25ct 82.9333%
Fast 🕔 Slow 🕛 120 120.16 C3 C3, -2ct ~100%
Slow 🕛 Normal 🕖 120 103.13 C3 A2, +37ct 85.9416%
Normal 🕛 Normal 🕛 120 119.92 C3 C3, -2ct ~100%
Fast 🕔 Normal 🕖 120 144.68 C3 D#3, +24ct 120.5666%
Slow 🕛 Fast 🕔 120 120.03 C3 C3, +1ct ~100%
Normal 🕛 Fast 🕔 120 146.08 C3 D#3, -39ct 121.7333%
Fast 🕔 Fast 🕔 120 168.22 C3 F#3, +13ct 140.1833%

Sorted by Tape Speed In:

Tape Speed In Tape Speed Out BPM In BPM Out Key In Key Out Multiplier
Slow 🕛 Slow 🕛 120 85.63 C3 F#2, +15ct 70.9416%
Slow 🕛 Normal 🕖 120 103.13 C3 A2, +37ct 85.9416%
Slow 🕛 Fast 🕔 120 120.03 C3 C3, +1ct ~100%
Normal 🕛 Slow 🕛 120 99.52 C3 A2, -25ct 82.9333%
Normal 🕛 Normal 🕛 120 119.92 C3 C3, -2ct ~100%
Normal 🕛 Fast 🕔 120 146.08 C3 D#3, -39ct 121.7333%
Fast 🕔 Slow 🕛 120 120.16 C3 C3, -2ct ~100%
Fast 🕔 Normal 🕖 120 144.68 C3 D#3, +24ct 120.5666%
Fast 🕔 Fast 🕔 120 168.22 C3 F#3, +13ct 140.1833%

Spectrum Sweep

Sweeping the full spectrum gives really interesting results after 5k

Sweep - Raw

Sweep - Raw

Sweep - Tape

Sweep - Tape