The original pixie2 doesn't have the mechanism of variable frequency. The crystal oscillates only one frequency on both sending and receiving time. Typical operation of CW needs to support the CW band for 40m.
VXO (Variable Xrystal Oscillator) is a good option to support the variable frequency for the CW band. The super VXO has two X-tals in parallel and gets the wider range of frequency change with a variable capacitor like trimmer. My first design of frequency converage is 7000KHz-7030KHz, therefore, two 7030KHz X-tals will be used. Inductor and capacitor parameters will be decided to cover the frequency range.
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