Here are the major differences between the RC-505mkII and the RC-505.
| RC-505mkII | RC-505 | |
| Display | Graphic LCD (128 x 64 dots, backlit LCD) | 16 characters, 2 lines (backlit LCD) |
| Tracks | 5 | 5 |
| Sampling frequency | 44.1 kHz | 44.1 kHz |
| Data format | WAV (44.1 kHz, 32-bit float, stereo) | WAV (44.1 kHz, 16-bit linear, stereo) |
| Maximum Recording Time | Approx. 1.5 hours (1 track), Approx.13 hours (total of All memories) | Approx. 3 hours (1 track, total of all memories) |
| Maximum no. of storable phrase memories | 99 | 99 |
| Play screen variations | 7 | 3 |
| MIXER screen | ✔️ | - |
| Input | 4 MIC 1, 2 INPUT jacks: XLR type × 2 INST 1, 2 INPUT jacks: 1/4″ phone type × 2 | 3 XLR type × 1, 1/4″ phone type × 1 Stereo miniature phone |
| Phantom power | DC 48 V, 10 mA Max | DC 48 V, 10 mA Max |
| Output | 1/4″ phone type × 3 stereo pairs (mono output × 6), assignable PHONES OUTPUT jack |
1/4-inch phone type 1 ch |
| Loop FX | Input/output can be used for FX loop; external pedal can be used for track FX | - |
| Effect switches | 4 | 3 |
| Max. no. of simultaneous effects | 4 | 3 (some restrictions apply) |
| Effect type | INPUT FX: 49 types TRACK FX: 53 types MASTER FX: 2 types | INPUT FX: 21 types (common) TRACK FX: 25 types MASTER FX: 2 types |
| No. of storable effect settings | 4 banks | - |
| ELECTRIC FX | ✔️ | - |
| VOCODER FX | ✔ (supports MIDI notes) | ✔ (does not support MIDI notes) |
| Harmonizer FX | ✔ (supports chord detection via MIDI) | - |
| No. of FX supported in step sequences | 7 | - |
| MARK BACK function | ✔️ | - |
| BOUNCE IN function | ✔️ | - |
| Overdub mode | 3 types | 2 types |
| Changeable loop phrase playback speed | ✔️ | - |
| CTL jack | CTL 1, 2/EXP 1 jack and CTL 3, 4/EXP 2 jack | CTL 1, 2/EXP 1 jack |
| Assign | 16 | 16 (added in Version 2.0) |
| Rhythm | Kits: 16, types: 200 or more | Kits: depends on the pattern; types: 85 |
| USB Interface | Hi-Speed USB (USB mass storage class) Hi-Speed USB (USBAUDIO, USB-MIDI) 8 In / 8 Out Max. 32-bit/44.1 kHz | Hi-Speed USB (USB mass storage class) Hi-Speed USB (USBAUDIO, |
| BOSS TONE STUDIO | ✔️ | ✔️ |
| Dimensions | 420 (W) x 234 (D) x 67 (H) mm | 420 (W) x 210 (D) x 68 (H) mm |
| Weight | 1.8 kg | 1.4 kg |